{"title":"Spa Cartridges","description":"","products":[{"product_id":"02-03-008","title":"Spa Filter Cartridge for Jacuzzi J-300 - Replaces 6540-476, SD-00640","description":"\u003cdiv class=\"pz-pdp\"\u003e\n\u003ch3\u003eOverview\u003c\/h3\u003e\n\u003cp\u003eTreat your Jacuzzi spa to the spa-grade water clarity it was designed for with the Poolzilla replacement filter for Jacuzzi Premium J-300 and J-400 series hot tubs. This cartridge measures 15.5 inches in length and 6.625 inches in outer diameter — the exact dimensions needed to drop straight into your Jacuzzi filter canister with no adapters, no shimming, and no guesswork. The pleated polyester media is engineered to capture oils, lotions, hair, and fine debris that cloud hot tub water and irritate skin, while sealed end caps lock the cartridge firmly in place so dirty water can't sneak around the edges. The result is silky, sparkling water and a spa pump that runs smoothly without the strain of fighting through a clogged or ill-fitting filter.\u003c\/p\u003e\n\u003cp\u003eBecause hot tubs handle a higher concentration of body oils and lotions than pools do, plan to rinse this cartridge every two to four weeks and replace it every 12 to 15 months for typical residential use — sooner if you entertain often or notice water staying cloudy even after shocking. A fresh filter protects your spa pump from extra strain, helps your sanitizer work more efficiently, and keeps soak time feeling luxurious instead of murky. Swapping it out takes about two minutes: power off the spa, lift out the old cartridge, drop the new Poolzilla filter in, and you're done. Order yours today — and consider grabbing a spare so you can rotate one in while the other dries, doubling the life of each cartridge and keeping your spa ready for relaxation any night of the week.\u003c\/p\u003e\n\u003ch3\u003eWhat's Included\u003c\/h3\u003e\n\u003cp\u003eYour order includes the selected quantity of replacement spa filter cartridges. Each unit is individually inspected for quality before shipping.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Poolzilla","offers":[{"title":"Default Title","offer_id":40887251370030,"sku":"WH-02-03-008-2pk","price":52.24,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0016\/3453\/3422\/files\/02-03-008_pos1_60b2ac61-2a3f-48a2-9c91-3f35fd036823.jpg?v=1777509343"},{"product_id":"02-03-009","title":"Spa Filter Cartridge for UFC-164 - Replaces SD-01293, AK-6473164","description":"\u003cdiv class=\"pz-pdp\"\u003e\n\u003ch3\u003eOverview\u003c\/h3\u003e\n\u003cp\u003eKeep your Sundance spa running like the day you brought it home with the Poolzilla 02-03-009 replacement filter cartridge. Designed specifically for premium home spas, this filter measures 18.75 inches tall with an outer diameter of 5.625 inches — the exact dimensions needed to drop right into your existing filter canister without any adapters, trimming, or guesswork. The deep pleated polyester media gives you a generous dirt-trapping surface, which means more time soaking and less time cleaning. From skin oils and lotions to fine sediment and microscopic debris, this cartridge pulls it all out of your water so you step into a spa that's clear, clean, and ready whenever you are.\u003c\/p\u003e\n\u003cp\u003eFor best results, plan to rinse your filter every two to four weeks with a garden hose and replace the cartridge entirely every three to four months, or sooner if you notice cloudy water that won't clear up after shocking, longer heating cycles, or a noticeable rise in pump pressure. A tired filter forces your spa equipment to work harder, throws off your water chemistry, and makes every soak less enjoyable — so staying ahead of replacement is one of the easiest ways to protect your investment. Swapping in the new Poolzilla 02-03-009 takes just a couple of minutes: power down the spa, lift out the old cartridge, drop the new one in, and you're back to bubbling bliss. Order yours today and keep a spare on the shelf so your spa is always ready for the next relaxing evening under the stars.\u003c\/p\u003e\n\u003ch3\u003eWhat's Included\u003c\/h3\u003e\n\u003cp\u003eYour order includes the selected quantity of replacement spa filter cartridges. Each unit is individually inspected for quality before shipping.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Poolzilla","offers":[{"title":"Default Title","offer_id":40887251402798,"sku":"WH-02-03-009-1pk","price":29.99,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0016\/3453\/3422\/files\/02-03-009_pos1_fd09ab18-482e-4c99-934d-2cb709918016.jpg?v=1777509352"},{"product_id":"02-03-012","title":"Spa Filter Cartridge for Jacuzzi J300 - Replaces Pleatco PJW60TL-OTF2S, Unicel 6CH-961","description":"\u003cdiv class=\"pz-pdp\"\u003e\n\u003ch3\u003eOverview\u003c\/h3\u003e\n\u003cp\u003eBring your Jacuzzi spa back to spa-day perfection with the Poolzilla replacement filter cartridge designed for Jacuzzi Premium J-300 and J-400 series hot tubs. This generously sized cartridge measures 15.5 inches in length and 6.625 inches in outer diameter, with finely pleated polyester media that captures the body oils, lotions, sunscreen, and microscopic debris that turn clear spa water cloudy. The accordion-style pleats create a huge dirt-trapping surface area, meaning your filter pulls more gunk out of the water with each cycle and goes longer between cleanings. Sturdy molded end caps form a leak-proof seal inside your filter canister, so every drop of water passes through the media — not around it — for the silky-clear water your spa was built to deliver.\u003c\/p\u003e\n\u003cp\u003eSpa filters work harder than pool filters because the water volume is smaller and the bather load is bigger, so plan to rinse this cartridge every two to four weeks and replace it every 12 to 15 months — or sooner if you notice water staying cloudy after shocking, or your jets feeling weaker than usual. A fresh filter takes the strain off your pump, helps your sanitizer work more efficiently, and keeps the water genuinely clean for the people you love. Swapping it out takes just a couple of minutes: power down the spa, lift out the old cartridge, drop the new Poolzilla filter in, and you're back to soaking. Order one now — and grab a spare while you're at it — so your spa is always ready when you are.\u003c\/p\u003e\n\u003ch3\u003eWhat's Included\u003c\/h3\u003e\n\u003cp\u003eYour order includes the selected quantity of replacement spa filter cartridges. Each unit is individually inspected for quality before shipping.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Poolzilla","offers":[{"title":"Default Title","offer_id":40887251435566,"sku":"WH-02-03-012-2pk","price":45.59,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0016\/3453\/3422\/files\/02-03-012_pos1_429adce4-bb86-4669-9b0f-c17c607489ed.jpg?v=1777509362"},{"product_id":"02-03-010","title":"Spa Filter Cartridge for Rainbow Dynamic 25 - Replaces PC-2375, Pleatco 17-2327","description":"\u003cdiv class=\"pz-pdp\"\u003e\n\u003ch3\u003eOverview\u003c\/h3\u003e\n\u003cp\u003eKeep your spa or above-ground pool sparkling with the Poolzilla Rainbow 25 replacement filter cartridge — a perfectly sized, hard-working filter that punches well above its compact frame. The pleated polyester media traps oils, lotions, leaves, and fine particles that cloud your water, while the accordion-style pleats create extra surface area so dirt has plenty of room to collect before you need to rinse. Measuring 13-5\/16 inches tall with a 5-inch outer diameter and a 2-1\/8 inch center hole, this cartridge is engineered to drop right into standard residential filter housings without shims, adapters, or guesswork. Sturdy molded end caps lock in place to prevent bypass — meaning dirty water can't sneak around the filter — so every drop that returns to your pool is genuinely clean. The result? Clearer water, less chemical usage, and more time enjoying your backyard instead of fussing with maintenance.\u003c\/p\u003e\n\u003cp\u003eFor best results, plan to rinse the Rainbow 25 every four to six weeks and replace it every three to six months — or anytime you notice your pump pressure climbing 8–10 PSI above normal, water clarity dropping even after shocking, or chemicals struggling to hold steady. A fresh cartridge does more than improve appearance: it reduces strain on your pump motor, helps your sanitizer work more efficiently, and keeps the water your family swims in genuinely safe and clean. Replacement is as easy as it gets — power off the pump, open the filter housing, lift out the old cartridge, drop in your new Poolzilla Rainbow 25, and you're done. Order today and keep a spare on the shelf so you're always ready for swim season, weekend guests, or that first warm day when nothing should stand between you and a perfect dip.\u003c\/p\u003e\n\u003ch3\u003eWhat's Included\u003c\/h3\u003e\n\u003cp\u003eYour order includes the selected quantity of replacement pool filter cartridges. Each unit is individually inspected for quality before shipping.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Poolzilla","offers":[{"title":"Default Title","offer_id":40887254220846,"sku":"WH-02-03-010-2pk","price":35.59,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0016\/3453\/3422\/files\/02-03-010_pos1_138dc41d-7db2-4e52-afed-72bdf244429f.jpg?v=1777509372"},{"product_id":"02-03-014","title":"Spa Filter Cartridge for Guardian 409-219 - Replaces Aladdin 13501, SD-00198","description":"\u003cdiv class=\"pz-pdp\"\u003e\n\u003ch3\u003eOverview\u003c\/h3\u003e\n\u003cp\u003eKeep your spa water silky-smooth and crystal clear with the Poolzilla Rainbow 35 replacement filter cartridge. With 35 square feet of densely pleated filtration media, this cartridge traps oils, lotions, hair, and fine debris that cloud hot tub water — giving you more soak time and less scrubbing time. Measuring 9.25 inches in length and 5.0 inches in outer diameter with a 2-1\/8 inch center hole, it's perfectly sized to drop right into standard Rainbow-style spa filter canisters without any modifications or adapters. The accordion-style pleats dramatically increase the dirt-trapping surface, which means your filter holds more debris between cleanings and your pump doesn't have to work overtime to push water through. Rigid molded end caps create a leak-proof seal so every drop of water passes through the filtration media — not around it.\u003c\/p\u003e\n\u003cp\u003eBecause spa filters handle smaller water volumes with heavier bather loads than pool filters, plan to rinse your Rainbow 35 every two to four weeks and replace it every three to four months with regular use (or every six months for seasonal spas). You'll know it's time for a fresh cartridge when the water stays cloudy even after you shock it, when your jets feel weaker than usual, or when pump pressure climbs noticeably above its normal reading. A fresh filter doesn't just look better — it reduces chemical usage, eases strain on your pump motor, and keeps the water your family soaks in genuinely clean. Order your Poolzilla Rainbow 35 today, and consider grabbing a spare so you always have a fresh cartridge ready to rotate in. Clear water, happy soaks, zero hassle.\u003c\/p\u003e\n\u003ch3\u003eWhat's Included\u003c\/h3\u003e\n\u003cp\u003eYour order includes the selected quantity of replacement pool filter cartridges. Each unit is individually inspected for quality before shipping.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Poolzilla","offers":[{"title":"Default Title","offer_id":40887254319150,"sku":"WH-02-03-014-2pk","price":42.39,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0016\/3453\/3422\/files\/02-03-014_pos1_ec36f760-c759-40a0-8571-beda7e8bd15f.jpg?v=1777509382"},{"product_id":"02-03-015","title":"Spa Filter Cartridge for 78161 - Replaces 78286, Watkins PWK35B","description":"\u003cdiv class=\"pz-pdp\"\u003e\n\u003ch3\u003eOverview\u003c\/h3\u003e\n\u003cp\u003eKeep your Watkins Hot Spring spa water silky-smooth and crystal clear with the Poolzilla PWK35B replacement filter cartridge — a precision-built drop-in designed specifically for Watkins hot tub systems. Measuring 14 1\/8 inches tall with a 6 3\/8-inch outer diameter and a 1 15\/16-inch center hole, this cartridge is sized to fit your Watkins filter canister exactly the way the original did, with no shimming, adapters, or guesswork required. The deep, evenly spaced pleats dramatically expand the dirt-trapping surface area, catching body oils, lotions, hair, and the fine particles that cloud spa water and clog jets. Sturdy molded end caps create a leak-proof seal so every drop of water passes through the media — not around it — giving you cleaner water, easier maintenance, and the kind of clarity that makes stepping into the hot tub a treat.\u003c\/p\u003e\n\u003cp\u003eSpa filters work overtime because hot water, jets, and bather oils put extra demand on the filtration media, so plan to rinse your PWK35B every two to four weeks and replace it every three to four months with regular use (or every six months for lighter, seasonal soaking). When you notice cloudy water that won't clear after shocking, weaker jet pressure, or your spa working harder than usual to heat and circulate, that's your cue to swap in a fresh cartridge. A clean filter protects your pump, helps your sanitizer do its job, and keeps the water genuinely safe for the people you love. Order your Poolzilla PWK35B today — and consider grabbing a spare so you always have a fresh cartridge ready when soak time calls.\u003c\/p\u003e\n\u003ch3\u003eWhat's Included\u003c\/h3\u003e\n\u003cp\u003eYour order includes the selected quantity of replacement spa filter cartridges. Each unit is individually inspected for quality before shipping.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Poolzilla","offers":[{"title":"Default Title","offer_id":40887254351918,"sku":"WH-02-03-015-1pk","price":34.99,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0016\/3453\/3422\/files\/02-03-015_pos1_e64af165-12d8-4e4c-9cff-e5e70867ff69.jpg?v=1777509393"},{"product_id":"02-01-002","title":"Poolzilla Hot Tub Mineral Sanitizer Stick, for Reduced Impurities","description":"","brand":"Poolzilla","offers":[{"title":"1-Pack","offer_id":40996263297070,"sku":"WH-02-01-002-1pk","price":9.49,"currency_code":"USD","in_stock":true},{"title":"2-Pack","offer_id":40996263329838,"sku":"WH-02-01-002-2pk","price":15.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0016\/3453\/3422\/files\/02-01-002_pos1_af3f0753-d528-4e19-9b1a-d7d1ab62e35d.jpg?v=1777509411"},{"product_id":"02-03-011","title":"Spa Filter Cartridge for Pleatco PWK30 - Replaces Unicel C-6430, APCC7095","description":"\u003cdiv class=\"pz-pdp\"\u003e\n\u003ch3\u003eOverview\u003c\/h3\u003e\n\u003cp\u003eBring back that just-installed clarity to your hot tub with the Poolzilla replacement filter for the Watkins Hot Spring 30. Built with deeply pleated polyester media, this cartridge captures the oils, lotions, hair, and fine particles that turn spa water cloudy — so every soak feels as fresh as the first one. Measuring 10⅜ inches tall with a 5⅞-inch outer diameter and a 1 15\/16-inch center hole, it's sized to drop precisely into your existing Hot Spring filter housing with no shimming, trimming, or adapters. Sturdy molded end caps create a leak-tight seal that prevents dirty water from slipping past, and the high-surface-area pleats mean your filter traps more debris between rinses — which translates to clearer water, less chemical use, and a spa that's always ready for company.\u003c\/p\u003e\n\u003cp\u003eBecause hot tubs run warmer water with heavier bather loads than pools, plan to rinse this cartridge every two to four weeks and replace it every three to four months with regular year-round use (or about every six months for lighter, seasonal soaking). Watch for the telltale signs it's time for a fresh one: water that stays cloudy even after shocking, foam that won't quit, or a noticeable jump in pump pressure. A worn-out filter forces your pump to work harder, throws off your chemistry, and shortens the lifespan of your spa equipment — all easily prevented with a quick swap. Order your Poolzilla Hot Spring 30 replacement today, and consider grabbing a spare while you're at it so you can rotate cartridges and keep your spa crystal clear all year long.\u003c\/p\u003e\n\u003ch3\u003eWhat's Included\u003c\/h3\u003e\n\u003cp\u003eYour order includes the selected quantity of replacement spa filter cartridges. Each unit is individually inspected for quality before shipping.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Poolzilla","offers":[{"title":"3-Pack","offer_id":40996264181806,"sku":"WH-02-03-011-3PK","price":44.99,"currency_code":"USD","in_stock":true},{"title":"5-Pack","offer_id":40996264214574,"sku":"WH-02-03-011-5PK","price":78.74,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0016\/3453\/3422\/files\/02-03-011_pos1_16870588-5515-4ae7-b1bf-22c7be7fe364.jpg?v=1777509478"},{"product_id":"8ch-950","title":"Poolzilla Spa Filter Cartridge, Compatible with Bullfrog, PBF35, PBF50-F2S, Filbur FC-0536, Excel Filters XLS-834, Pure N Clean PC-0536, Aladdin 15052, Baleen AK-90311","description":"","brand":"Poolzilla","offers":[{"title":"1-Pack","offer_id":40996269981742,"sku":"WH-PZ-8CH-950","price":19.99,"currency_code":"USD","in_stock":false},{"title":"2-Pack","offer_id":40996270014510,"sku":"WH-PZ-8CH-950-2PK","price":39.99,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0016\/3453\/3422\/files\/8ch-950_pos1_20a36859-8ce0-44cf-b34d-f41ab3b2fc9e.jpg?v=1777509484"},{"product_id":"c-7367","title":"Spa Filter Cartridge for PC-3059 - Replaces XLS-7005, Unicel C-7367","description":"\u003cdiv class=\"pz-pdp\"\u003e\n\u003ch3\u003eOverview\u003c\/h3\u003e\n\u003cp\u003ePremium replacement spa filter cartridge. Drop-in compatible - no modifications needed. Designed for easy installation and reliable filtration performance.\u003c\/p\u003e\n\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003ctable class=\"pz-specs\"\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eType\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eSpa\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eCompatibility\u003c\/h3\u003e\n\u003cp\u003eThis spa filter cartridge is a direct replacement for the following models:\u003c\/p\u003e\n\u003ctable class=\"pz-compat\"\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eOEM (Unicel)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eC-7367\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003ePleatco\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003ePD075-2000\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eUnicel\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eC-7367\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eFilbur\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eFC-3059\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eAlso Replaces\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003ePC-3059, XLS-7005\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eWhat's Included\u003c\/h3\u003e\n\u003cp\u003eYour order includes the selected quantity of replacement spa filter cartridges. Each unit is individually inspected for quality before shipping.\u003c\/p\u003e\n\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eHow often should I replace my spa filter cartridge?\u003c\/strong\u003e\u003cbr\u003e\nWe recommend replacing your filter cartridge every 12 months, or sooner if you notice reduced water flow or increased filter pressure (8-10 PSI above clean baseline).\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eIs this compatible with my system?\u003c\/strong\u003e\u003cbr\u003e\nCheck the compatibility table above. If your current filter's part number matches any listed model, this is a direct drop-in replacement.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Poolzilla","offers":[{"title":"1-Pack","offer_id":40996274798638,"sku":"WH-PZ-C-7367","price":29.99,"currency_code":"USD","in_stock":false},{"title":"2-Pack","offer_id":40996274831406,"sku":"WH-PZ-C-7367-2PK","price":64.99,"currency_code":"USD","in_stock":false},{"title":"4-Pack","offer_id":40996274864174,"sku":"WH-PZ-C-7367-4pc","price":99.99,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0016\/3453\/3422\/files\/c-7367_pos1_c47b906b-5d24-4bca-9e5d-68ed4fba6985.jpg?v=1777509493"},{"product_id":"c-8326","title":"Poolzilla Spa Filter Cartridge for Sundance 6540-488 PSD125-2000 Unicel C-8326 Filbur FC-2780 Aladdin 22507 Baleen AK-70013 Magnum SU125","description":"","brand":"Poolzilla","offers":[{"title":"1-Pack","offer_id":40996274896942,"sku":"WH-PZ-C-8326-1pc","price":64.99,"currency_code":"USD","in_stock":false},{"title":"2-Pack","offer_id":40996274929710,"sku":"WH-PZ-C-8326-2pc","price":119.99,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0016\/3453\/3422\/files\/c-8326_pos1_621157f0-0e2f-4551-bdb7-ad043c61011f.jpg?v=1777509500"},{"product_id":"fc-2402","title":"Spa Filter Cartridge for 78460 - Replaces SD-01322, ACT-50SQFLTR","description":"\u003cdiv class=\"pz-pdp\"\u003e\n\u003ch3\u003eOverview\u003c\/h3\u003e\n\u003cp\u003eKeep your Freeflow Spa water silky, fresh, and inviting with the Poolzilla Freeflow 2013 replacement filter cartridge — a precision-built pleated cartridge designed specifically for Freeflow Spas and other compatible portable hot tubs. With its compact 5.25-inch outer diameter and 9.375-inch length, this cartridge is engineered to slide right into your spa's filter compartment with no modifications, no adapters, and no second-guessing. The fine-pleated polyester media captures body oils, lotions, hair, and fine debris that cloud spa water and dull your jets, while the closed-end (no-hole) design seals tightly against the filter standpipe to prevent unfiltered water from sneaking past. Rigid molded end caps add durability so the cartridge holds its shape rinse after rinse, giving you cleaner water, gentler skin contact, and a spa that's always ready when you are.\u003c\/p\u003e\n\u003cp\u003eSpa filters work hard in a small water volume, so plan to rinse this cartridge every two to four weeks with a garden hose and replace it every three to four months with regular use (or every six months for lighter, seasonal soaks). You'll know it's time for a fresh cartridge when your water turns cloudy even after shocking, the jets feel weaker than usual, or your spa pump sounds like it's straining. A clean filter means clearer water, better chemical efficiency, and less wear on your spa's pump — all of which add up to more relaxing soaks and fewer maintenance surprises. Order your Poolzilla Freeflow 2013 cartridge today, and consider grabbing a spare to keep on the shelf so your spa is always ready for that after-dinner soak or weekend gathering.\u003c\/p\u003e\n\u003ch3\u003eWhat's Included\u003c\/h3\u003e\n\u003cp\u003eYour order includes the selected quantity of replacement spa filter cartridges. Each unit is individually inspected for quality before shipping.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Poolzilla","offers":[{"title":"1-Pack","offer_id":40996276371502,"sku":"WH-PZ-FC-2402","price":24.01,"currency_code":"USD","in_stock":true},{"title":"2-Pack","offer_id":40996276404270,"sku":"WH-PZ-FC-2402-2PK","price":38.19,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0016\/3453\/3422\/files\/fc-2402_pos1_e3f41a7d-5fe2-4480-af81-e7203a2517a6.jpg?v=1777509509"},{"product_id":"intsi","title":"Poolzilla Replacement Easy Set Pool Filter for PureSpa Type S1, 29001E","description":"","brand":"Poolzilla","offers":[{"title":"2-Pack","offer_id":40996278337582,"sku":"WH-PZ-INTSI-2pc","price":19.99,"currency_code":"USD","in_stock":false},{"title":"6-Pack","offer_id":40996278370350,"sku":"WH-PZ-INTSI-6pc","price":16.99,"currency_code":"USD","in_stock":false},{"title":"12-Pack","offer_id":40996278403118,"sku":"WH-PZ-INTSI-12pc","price":23.99,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0016\/3453\/3422\/files\/intsi_pos1_9e5f01b8-b399-499e-b2bd-400ffdff3bd9.jpg?v=1777509527"},{"product_id":"plfbwi","title":"Poolzilla Replacement Spa Filter for Bestway Type I, 300\/330 gal\/h (220-240V) Filter Pumps Systems, Summer Waves P53RX0330000 and P53FX0330000","description":"\u003cdiv class=\"pz-pdp\"\u003e\n\u003ch3\u003eOverview\u003c\/h3\u003e\n\u003cp\u003eBring crystal-clear water back to your inflatable hot tub with the Poolzilla PZ-BWVI replacement spa filter cartridge. Designed specifically for the compact filtration systems found on Bestway and Coleman SaluSpa portable spas, this little cartridge punches well above its weight when it comes to catching the body oils, lotions, leaves, and fine debris that cloud up hot tub water. Measuring just 4.2 inches in outer diameter and 3.1 inches in length, it slides right into your spa's built-in filter housing with zero modifications — the kind of perfect drop-in fit that turns filter changes into a 30-second chore. Pleated polyester media gives you more dirt-trapping surface area than a flat filter could ever offer, so your pump moves water efficiently and your spa stays the clean, relaxing escape it was meant to be.\u003c\/p\u003e\n\u003cp\u003eBecause inflatable hot tubs hold less water than traditional spas, the filter works overtime to keep things sanitary — so plan to rinse the PZ-BWVI weekly with a garden hose and replace it every two to four weeks of regular use. You'll know it's time for a fresh one when the pleats start to look gray or matted, when water clarity drops even after balancing your chemicals, or when your pump sounds like it's straining. The good news? Swapping in a new filter takes less than a minute: unscrew the housing cap, pull out the old cartridge, drop in the new one, and you're back to soaking. Stock up on a few PZ-BWVI cartridges now so you've always got a fresh one ready before your next backyard staycation — clean, clear hot tub water is just an order away.\u003c\/p\u003e\n\u003ch3\u003eWhat's Included\u003c\/h3\u003e\n\u003cp\u003eYour order includes the selected quantity of replacement pool filter cartridges. Each unit is individually inspected for quality before shipping.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Poolzilla","offers":[{"title":"2-Pack","offer_id":40996279091246,"sku":"WH-PZ-PLFBWI-2pk","price":9.99,"currency_code":"USD","in_stock":false},{"title":"4-Pack","offer_id":40996279124014,"sku":"WH-PZ-PLFBWI-4pk","price":14.99,"currency_code":"USD","in_stock":false},{"title":"6-Pack","offer_id":40996279156782,"sku":"WH-PZ-PLFBWI-6pk","price":22.99,"currency_code":"USD","in_stock":false},{"title":"12-Pack","offer_id":40996279189550,"sku":"WH-PZ-PLFBWI-12pk","price":37.99,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0016\/3453\/3422\/files\/plfbwi_pos1_8bcb121c-9e5a-47ef-b70f-b9dac8b98e14.jpg?v=1777509553"},{"product_id":"plfc-8465","title":"Spa Filter Cartridge for 76136 - Replaces Filbur  FC-3960, 71827","description":"\u003cdiv class=\"pz-pdp\"\u003e\n\u003ch3\u003eOverview\u003c\/h3\u003e\n\u003cp\u003eKeep your Hot Spring spa water silky-smooth and crystal clear with the Poolzilla PZ-8465 replacement filter cartridge, purpose-built for Watkins Hot Spring 65 spa systems. With a generous 65 square foot pleated polyester filtration surface, this cartridge captures body oils, lotions, fine sediment, and debris that cloud spa water and dull its sparkle — leaving you with the kind of clean, inviting soak you bought your hot tub for in the first place. Measuring 8.5 inches in outer diameter, 10.5 inches in length, and featuring a 3-inch center hole, the PZ-8465 is engineered to drop right into your Hot Spring filter housing without shims, adapters, or any modifications. Heavy-duty molded end caps create a leak-proof seal so every drop of water passes through the pleats — not around them — meaning more dirt trapped, less work for your pump, and consistently beautiful water week after week.\u003c\/p\u003e\n\u003cp\u003eHot tub filters work harder than pool filters because the water volume is small and bather loads are high, so plan to rinse your PZ-8465 every two to four weeks with a garden hose and replace it every 12 to 15 months — or sooner if you notice cloudy water that won't clear up after shocking, or if your pump pressure starts running higher than usual. A fresh filter keeps your sanitizer working efficiently, protects your circulation pump from strain, and ensures every soak feels as clean as the first. When replacement day comes, the swap takes about two minutes: power down the spa, unscrew the old cartridge, twist the new Poolzilla filter into place, and you're back to bubbling bliss. Order your PZ-8465 today — and grab a backup while you're at it, so you're always ready for that spontaneous evening soak under the stars.\u003c\/p\u003e\n\u003ch3\u003eWhat's Included\u003c\/h3\u003e\n\u003cp\u003eYour order includes the selected quantity of replacement spa filter cartridges. Each unit is individually inspected for quality before shipping.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Poolzilla","offers":[{"title":"1-Pack","offer_id":40996279320622,"sku":"WH-PZ-PLFC-8465","price":42.38,"currency_code":"USD","in_stock":false},{"title":"2-Pack","offer_id":40996279353390,"sku":"WH-PZ-PLFC-8465-2PC","price":55.86,"currency_code":"USD","in_stock":false},{"title":"4-Pack","offer_id":40996279386158,"sku":"WH-PZ-PLFC-8465-4PC","price":99.74,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0016\/3453\/3422\/files\/plfc-8465_pos1_2ebc35e6-c60c-4ff4-90d7-980e35892a39.jpg?v=1777509563"},{"product_id":"prb25in-m","title":"Spa Filter Cartridge for Rainbow Dynamic 25 - Replaces PC-2375, Pleatco 17-2327","description":"\u003cdiv class=\"pz-pdp\"\u003e\n\u003ch3\u003eOverview\u003c\/h3\u003e\n\u003cp\u003ePremium replacement spa filter cartridge. Drop-in compatible - no modifications needed. Designed for easy installation and reliable filtration performance.\u003c\/p\u003e\n\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003ctable class=\"pz-specs\"\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eType\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eSpa\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eCompatibility\u003c\/h3\u003e\n\u003cp\u003eThis spa filter cartridge is a direct replacement for the following models:\u003c\/p\u003e\n\u003ctable class=\"pz-compat\"\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eOEM (Pleatco)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e17-2327,100586,33521,25392,303909,M-4326,817-2500,R173429\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003ePleatco\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003ePRB25-IN\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eUnicel\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eC-4326\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eFilbur\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eFC-2375\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eAlso Replaces\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eRainbow Dynamic 25, PC-2375\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eWhat's Included\u003c\/h3\u003e\n\u003cp\u003eYour order includes the selected quantity of replacement spa filter cartridges. Each unit is individually inspected for quality before shipping.\u003c\/p\u003e\n\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eHow often should I replace my spa filter cartridge?\u003c\/strong\u003e\u003cbr\u003e\nWe recommend replacing your filter cartridge every 12 months, or sooner if you notice reduced water flow or increased filter pressure (8-10 PSI above clean baseline).\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eIs this compatible with my system?\u003c\/strong\u003e\u003cbr\u003e\nCheck the compatibility table above. If your current filter's part number matches any listed model, this is a direct drop-in replacement.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Poolzilla","offers":[{"title":"1-Pack","offer_id":40996281319470,"sku":"WH-PZ-PRB25IN-M-1pc","price":19.99,"currency_code":"USD","in_stock":false},{"title":"2-Pack","offer_id":40996281352238,"sku":"WH-PZ-PRB25IN-M-2pc","price":38.99,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0016\/3453\/3422\/files\/prb25in-m_pos1_69b0fd7f-3a9b-4b63-9eff-4960308c5c25.jpg?v=1777509570"},{"product_id":"prb50-in","title":"Spa Filter Cartridge for SD-00201 - Replaces SD-00455, Aladdin 15002","description":"\u003cdiv class=\"pz-pdp\"\u003e\n\u003ch3\u003eOverview\u003c\/h3\u003e\n\u003cp\u003ePremium replacement pool filter cartridge engineered to meet or exceed OEM specifications. Designed for easy installation and reliable filtration performance.\u003c\/p\u003e\n\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003ctable class=\"pz-specs\"\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eType\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eSpa\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eCompatibility\u003c\/h3\u003e\n\u003cp\u003eThis pool filter cartridge is a direct replacement for the following models:\u003c\/p\u003e\n\u003ctable class=\"pz-compat\"\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eOEM (Pleatco)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e03FIL1600,17-2380,RTL-50,100533,6540-471,25391,817-5000,R173434\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003ePleatco\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003ePRB50-IN\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eUnicel\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eC-4950\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eFilbur\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eFC-2390\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eAlso Replaces\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eSD-00201, SD-00455, Aladdin 15002, 25391, PLE-051-0088, PLE-051-9180, 15002ECO\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eWhat's Included\u003c\/h3\u003e\n\u003cp\u003eYour order includes the selected quantity of replacement pool filter cartridges. Each unit is individually inspected for quality before shipping.\u003c\/p\u003e\n\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eHow often should I replace my pool filter cartridge?\u003c\/strong\u003e\u003cbr\u003e\nWe recommend replacing your filter cartridge every 12 months, or sooner if you notice reduced water flow or increased filter pressure (8-10 PSI above clean baseline).\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eIs this compatible with my system?\u003c\/strong\u003e\u003cbr\u003e\nCheck the compatibility table above. If your current filter's part number matches any listed model, this is a direct drop-in replacement.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Poolzilla","offers":[{"title":"1-Pack","offer_id":40996281385006,"sku":"WH-PZ-PRB50-IN-1pc","price":22.0,"currency_code":"USD","in_stock":false},{"title":"2-Pack","offer_id":40996281417774,"sku":"WH-PZ-PRB50-IN-2pc","price":37.0,"currency_code":"USD","in_stock":false},{"title":"3-Pack","offer_id":40996281450542,"sku":"WH-PZ-PRB50-IN-3pc","price":49.99,"currency_code":"USD","in_stock":false},{"title":"4-Pack","offer_id":40996281483310,"sku":"WH-PZ-PRB50-IN-4pc","price":62.5,"currency_code":"USD","in_stock":false},{"title":"6-Pack","offer_id":40996281516078,"sku":"WH-PZ-PRB50-IN-6pc","price":94.99,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0016\/3453\/3422\/files\/prb50-in_pos1_015e0fc0-0aed-4368-84e2-dffdf0ccc0d9.jpg?v=1777509578"},{"product_id":"unicel-c-3310am","title":"Unicel C-3310AM Replacement Filter for Master Spas ELE-10AM | 8 Sq. Ft.","description":"\u003cdiv class=\"pz-pdp\"\u003e\n\u003ch3\u003eOverview\u003c\/h3\u003e\n\u003cp\u003eThe Unicel C-3310AM is a pleated polyester antimicrobial spa cartridge filter element engineered for Master Spas circulation systems, delivering 8.0 sq ft of filtration area through a low-profile, single-element form factor. Media construction utilizes Reemay-grade nonwoven polyester treated with an integrated antimicrobial agent that inhibits bacterial and fungal colonization on the fabric surface between service intervals — a critical specification for the elevated-temperature, high-bather-load environment of dedicated spa applications. End cap configuration features ABS injection-molded top and bottom caps with the standard Master Spas threaded-base interface for direct manifold seating. Nominal filtration efficiency is 20 microns. Maximum rated continuous service temperature is 115°F with intermittent excursions to 120°F acceptable; operating pressure range conforms to the 5–15 PSI envelope typical of spa circulation pumps. The antimicrobial fabric treatment extends usable service life under continuous-duty residential spa operation relative to untreated polyester equivalents.\u003c\/p\u003e\n\u003cp\u003eService interval recommendation: rinse with fresh water every 2–4 weeks; chemical soak in dilute TSP or dedicated cartridge cleaner every 4–6 weeks to remove body oils, lotions, and surfactant residue that standard rinsing cannot extract. Element replacement is recommended at 12-month intervals for typical residential spa use, or at ΔP ≥ 5 PSI above clean operating baseline, whichever occurs first. The antimicrobial treatment supplements but does not replace standard sanitizer maintenance; maintain free chlorine at ≤ 10 ppm or total bromine at ≤ 30 ppm for fabric compatibility. Muriatic acid soak at 1:20 dilution is compatible for calcium scale removal (20-minute maximum exposure, thorough rinse required); enzyme cleaners compatible without restriction. Verify ozone compatibility with sanitization system specification before deployment in ozone-primary installations. Standard Unicel 90-day manufacturing defect warranty applies through authorized distribution.\u003c\/p\u003e\n\u003ch3\u003eWhat's Included\u003c\/h3\u003e\n\u003cp\u003eYour order includes the selected quantity of replacement spa filter cartridges. Each unit is individually inspected for quality before shipping.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Unicel","offers":[{"title":"Default Title","offer_id":42315910971438,"sku":"UNFC3310AM","price":21.22,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0016\/3453\/3422\/files\/UNFC3310AM_874032bd-cbda-4712-80cd-614d7d866af2.jpg?v=1777663098"},{"product_id":"unicel-c-4305","title":"Unicel C-4305 Replacement Filter for Sundance Spas 6540-497 | 50 Sq. Ft.","description":"\u003cdiv class=\"pz-pdp\"\u003e\n\u003ch3\u003eOverview\u003c\/h3\u003e\n\u003cp\u003eThe Unicel C-4305 is a pleated polyester spa cartridge filter element providing 50.0 sq ft of filtration area, engineered for high-flow Sundance Spas circulation systems and equivalent dimensional applications. Media construction utilizes Reemay nonwoven polyester at a nominal 20-micron filtration efficiency, supported on a perforated internal core for structural rigidity under spa-rated operating pressures. End cap configuration is ABS injection-molded with a top-handle\/closed-bottom geometry typical of the Sundance Microclean platform, with end cap adhesive bond rated for continuous service at spa-elevated temperatures up to 115°F. The 50 sq ft surface area distributes flow across an extended pleat pack, reducing media face velocity and extending service intervals between chemical cleanings under typical residential bather loads.\u003c\/p\u003e\n\u003cp\u003eService interval recommendation: rinse with fresh water every 2–4 weeks under typical residential use; chemical soak with TSP-based or commercial enzyme spa filter cleaner every 4–6 weeks to remove accumulated oils, lotions, and surfactant residues that water rinsing alone will not clear. Replacement is recommended at 12–15 month intervals or at ΔP ≥ 5 PSI above clean-filter operating baseline, whichever occurs first. Chemical compatibility: polyester media and ABS end caps tolerate continuous service at ≤ 10 ppm free available chlorine or ≤ 30 ppm total bromine; muriatic acid soak at 1:20 dilution is compatible for calcium scale remediation (20-minute maximum exposure, followed by thorough fresh-water rinse). Verify ozone system compatibility before deployment in ozone-primary sanitization configurations. Standard Unicel 90-day manufacturing defect warranty applies through authorized distribution.\u003c\/p\u003e\n\u003ch3\u003eWhat's Included\u003c\/h3\u003e\n\u003cp\u003eYour order includes the selected quantity of replacement spa filter cartridges. Each unit is individually inspected for quality before shipping.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Unicel","offers":[{"title":"Default Title","offer_id":42315911168046,"sku":"UNFC4305","price":43.62,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0016\/3453\/3422\/files\/UNFC4305_7da3648b-5d21-435b-afd6-2b514d1a142f.jpg?v=1777663109"},{"product_id":"unicel-c-4317","title":"Unicel C-4317 Replacement Filter for Intex Type S1","description":"\u003cdiv class=\"pz-pdp\"\u003e\n\u003ch3\u003eOverview\u003c\/h3\u003e\n\u003cp\u003eThe Unicel C-4317 is a pleated polyester cartridge filter element engineered for above-ground pool applications utilizing the Intex Type S1 filtration platform. Filtration area is 18 sq ft, achieved through a Reemay nonwoven polyester media pack with nominal 20-micron filtration efficiency. Dimensional specifications: 4-1\/4\" OD, 2-1\/16\" ID, 2-15\/16\" length, with closed-bottom and open-flow top ABS injection-molded end caps. Construction is coreless, consistent with the low-pressure operating envelope of Intex saltwater and chlorine generator systems. Rated for continuous service to 104°F at operating pressures up to 15 PSI, the C-4317 matches the head curve characteristics of Intex Krystal Clear sand and SCG-paired filter pumps without underflow or bypass risk.\u003c\/p\u003e\n\u003cp\u003eService interval recommendation for seasonal above-ground installations: rinse weekly with fresh water during active swim season; replace at ΔP ≥ 5 PSI above clean-filter operating baseline, or every 2 weeks under continuous use with saltwater chlorine generator operation, whichever occurs first. Chemical soak (dilute TSP or enzyme cleaner) recommended at 4–6 week intervals to remove oils, sunscreen residues, and surfactants. Chemical compatibility: polyester fabric tolerates continuous operation at ≤ 10 ppm free available chlorine; muriatic acid wash at 1:20 dilution (20-minute maximum exposure) is compatible with the ABS end cap construction for calcium scale removal. Enzyme cleaner compatible without restriction. Standard Unicel 90-day manufacturer's defect warranty applies through authorized distribution.\u003c\/p\u003e\n\u003ch3\u003eWhat's Included\u003c\/h3\u003e\n\u003cp\u003eYour order includes the selected quantity of replacement pool filter cartridges. Each unit is individually inspected for quality before shipping.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Unicel","offers":[{"title":"Default Title","offer_id":42315911266350,"sku":"UNFC4317","price":11.76,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0016\/3453\/3422\/files\/UNFC4317_76b49941-7f17-44ba-9df1-341f32fb30f3.jpg?v=1777663127"},{"product_id":"unicel-c-4440","title":"Unicel C-4440 Replacement Filter for Sundance Spas 6540-501 | 40 Sq. Ft.","description":"\u003cdiv class=\"pz-pdp\"\u003e\n\u003ch3\u003eOverview\u003c\/h3\u003e\n\u003cp\u003eThe Unicel C-4440 is a pleated polyester spa cartridge filter element providing 40.0 sq ft of filtration area in a compact, high-capacity form factor engineered for Sundance Spas circulation systems. Construction consists of Reemay nonwoven polyester media at nominal 15-micron filtration efficiency, supported by injection-molded ABS end caps in a closed-bottom, threaded-top configuration matched to the Sundance 6540-501 housing interface. The threaded top end cap provides a positive seal against the filter standpipe, eliminating bypass under operating conditions. Element is rated for continuous service to 115°F with intermittent excursions to 120°F acceptable per manufacturer testing protocol. Operating pressure range conforms to standard spa circulation pump output: 5–15 PSI nominal. The 40.0 sq ft media area supports extended service intervals between rinse cycles relative to lower-capacity spa elements, reducing maintenance frequency in high-bather-load applications.\u003c\/p\u003e\n\u003cp\u003eService interval recommendation: rinse with fresh water every 2–4 weeks under standard residential bather load; chemical soak in dilute TSP or commercial enzyme cleaner every 4–6 weeks to remove accumulated body oils, lotions, and surfactant residues that resist water rinse. Replacement trigger: ΔP ≥ 5 PSI above clean-filter operating baseline, or 12-month calendar interval, whichever occurs first; spas in continuous-use or high-bather-load service should be evaluated at 6-month intervals. Chemical compatibility: polyester fabric and ABS end caps tolerate continuous operation at ≤ 10 ppm free available chlorine or ≤ 30 ppm total bromine; muriatic acid soak at 1:20 dilution is compatible for calcium scale remediation (20-minute maximum exposure, thorough rinse required before reinstallation). Enzyme cleaners compatible without restriction. Standard Unicel 90-day manufacturing defect warranty applies through authorized distribution.\u003c\/p\u003e\n\u003ch3\u003eWhat's Included\u003c\/h3\u003e\n\u003cp\u003eYour order includes the selected quantity of replacement spa filter cartridges. Each unit is individually inspected for quality before shipping.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Unicel","offers":[{"title":"Default Title","offer_id":42315911692334,"sku":"UNFC4440","price":49.1,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0016\/3453\/3422\/files\/UNFC4440_d145a215-f014-469f-86e0-2e15a14ce7ce.jpg?v=1777663163"},{"product_id":"unicel-c-5346","title":"Unicel C-5346 Replacement Filter for Marquis Spas 03FIL0700 | 50 Sq. Ft.","description":"\u003cdiv class=\"pz-pdp\"\u003e\n\u003ch3\u003eOverview\u003c\/h3\u003e\n\u003cp\u003eThe Unicel C-5346 is a pleated polyester spa cartridge filter element engineered for Marquis Spas circulation systems, providing 50 sq ft of effective filtration area through a high-pleat-count Reemay nonwoven polyester media pack. The element features molded ABS end caps in a closed-bottom, open-top configuration with a standard 2-inch female SAE thread on the upper cap for threaded standpipe mounting common to Marquis-platform housings. Nominal filtration efficiency is rated at 15 microns under standard test conditions, with a maximum continuous service temperature of 115°F suitable for spa-rated operating environments. Construction is centered on a perforated PVC support core for axial rigidity under the cyclical pressure loading typical of spa pump duty. End cap adhesive bond is rated to ASTM D1002 shear standards at elevated spa operating temperatures.\u003c\/p\u003e\n\u003cp\u003eService interval recommendation for spa applications: rinse with fresh water every 2–4 weeks; chemical soak in dilute TSP or commercial enzyme\/degreaser every 4–6 weeks to remove body oils, lotions, and surfactant residue that resist standard rinsing. Replace at 12–15 month intervals under typical residential spa loading, or sooner if ΔP rises ≥ 5 PSI above clean-filter baseline, if visible fabric degradation is present, or if end cap bond shows signs of separation. Chemical compatibility: continuous service at ≤ 10 ppm free available chlorine or ≤ 30 ppm total bromine; muriatic acid soak (1:20 dilution, 20-minute maximum exposure) acceptable for calcium scale removal followed by thorough fresh-water rinse. Verify ozone or non-chlorine shock compatibility with sanitization system specification before deployment in supplemental oxidizer applications. Standard Unicel 90-day manufacturing defect warranty applies through authorized distribution.\u003c\/p\u003e\n\u003ch3\u003eWhat's Included\u003c\/h3\u003e\n\u003cp\u003eYour order includes the selected quantity of replacement spa filter cartridges. Each unit is individually inspected for quality before shipping.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Unicel","offers":[{"title":"Default Title","offer_id":42315912216622,"sku":"UNFC5346","price":45.65,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0016\/3453\/3422\/files\/UNFC5346_95af153c-af0f-4ece-81c3-4dad2de217a7.jpg?v=1777663215"},{"product_id":"unicel-c-5374","title":"Unicel C-5374 Replacement Filter for Waterway 500-0078 | 65 Sq. Ft.","description":"\u003cdiv class=\"pz-pdp\"\u003e\n\u003ch3\u003eOverview\u003c\/h3\u003e\n\u003cp\u003eThe Unicel C-5374 is a pleated polyester cartridge filter element engineered for mid-capacity residential spa and small pool applications, delivering 65.0 sq ft of filtration surface area through a Reemay nonwoven polyester media pack with nominal 15-micron filtration efficiency. Dimensional specifications conform to the Waterway 500-series form factor: 5-5\/16\" OD, 2-1\/8\" ID with handle-top configuration, and 14-13\/16\" overall length. Construction features ABS injection-molded end caps with a closed-bottom, handle-top geometry seated on a perforated PVC core for axial rigidity under standard spa-loop pressure. The element is rated for continuous service at temperatures up to 115°F and operating pressures to 25 PSI, with the elevated surface area providing extended dirt-holding capacity and reduced cycle frequency relative to lower-area equivalents in the same housing class.\u003c\/p\u003e\n\u003cp\u003eService interval recommendation: rinse with fresh water every 2–4 weeks under standard residential spa duty cycles; perform chemical soak (dilute TSP or dedicated enzyme cartridge cleaner) at 4–6 week intervals to remove oils, surfactants, and biofilm that resist water rinse. Replacement is recommended at 12–15 month intervals, or sooner when ΔP rises ≥ 5 PSI above the documented clean-filter baseline, or upon visual evidence of media channeling, pleat delamination, or end-cap bond failure. Chemical compatibility: polyester media and ABS end caps are compatible with continuous service at ≤ 10 ppm free available chlorine or ≤ 30 ppm total bromine; muriatic acid soak at 1:20 dilution is approved for calcium scale removal (20-minute maximum exposure, followed by thorough fresh-water rinse). Enzyme-based cartridge cleaners are compatible without restriction. Standard Unicel 90-day manufacturer's defect warranty applies through authorized distribution.\u003c\/p\u003e\n\u003ch3\u003eWhat's Included\u003c\/h3\u003e\n\u003cp\u003eYour order includes the selected quantity of replacement pool filter cartridges. Each unit is individually inspected for quality before shipping.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Unicel","offers":[{"title":"Default Title","offer_id":42315912249390,"sku":"UNFC5374","price":43.46,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0016\/3453\/3422\/files\/UNFC5374_b55c1966-0381-4b8a-a4e1-4305f100660a.jpg?v=1777663221"},{"product_id":"unicel-c-5396","title":"Unicel C-5396 Replacement Filter for Waterway 817-0100P | 100 Sq. Ft.","description":"\u003cdiv class=\"pz-pdp\"\u003e\n\u003ch3\u003eOverview\u003c\/h3\u003e\n\u003cp\u003eThe Unicel C-5396 is a pleated polyester cartridge filter element engineered for high-capacity residential spa and swim spa applications, delivering 100 sq ft of effective filtration area through a high-pleat-count Reemay nonwoven polyester media pack. Dimensional specifications: 5-5\/16\" OD, 2-1\/8\"  ID, 21-5\/16\" overall length. End caps are ABS injection-molded with a closed, threaded bottom configuration incorporating an integrated tightening handle and an open-flow top mating to the housing manifold seat. Nominal filtration efficiency is rated at 20 microns under standard test conditions. The element is rated for continuous service to 115°F with intermittent excursions to 120°F, suitable for the elevated thermal and chemical loading profile of high-bather-density spa circulation systems.\u003c\/p\u003e\n\u003cp\u003eService interval recommendation for spa and swim spa applications: fresh-water rinse every 2–4 weeks; chemical soak in dilute TSP or commercial enzyme cleaner every 4–6 weeks to remove body oils, surfactants, and lotion residues that resist mechanical rinsing. ΔP replacement trigger: ≥ 5 PSI above clean-filter operating baseline. Calendar replacement interval: 12–15 months under typical residential swim spa duty cycles, reduced to 6–9 months under continuous high-bather-load conditions. Chemical compatibility: polyester fabric and ABS end caps tolerate continuous operation at ≤ 10 ppm free available chlorine or ≤ 30 ppm total bromine; muriatic acid soak compatible at 1:20 dilution (20-minute maximum exposure) for calcium scale removal, followed by thorough fresh-water rinse before reinstallation. Enzyme cleaners compatible without restriction. Verify housing O-ring condition and lubricate with silicone-based O-ring grease at each service interval; confirm post-installation pressure reading against documented clean baseline. Standard Unicel 90-day manufacturing defect warranty applies through authorized distribution.\u003c\/p\u003e\n\u003ch3\u003eWhat's Included\u003c\/h3\u003e\n\u003cp\u003eYour order includes the selected quantity of replacement pool filter cartridges. Each unit is individually inspected for quality before shipping.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Unicel","offers":[{"title":"Default Title","offer_id":42315912282158,"sku":"UNFC5396","price":59.5,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0016\/3453\/3422\/files\/1_5f6308d9-abc1-474f-ab78-73c68f16873d.png?v=1778968206"},{"product_id":"unicel-c-5397","title":"Unicel C-5397 Replacement Filter for Waterway 500-0080 | 80 Sq. Ft.","description":"\u003cdiv class=\"pz-pdp\"\u003e\n\u003ch3\u003eOverview\u003c\/h3\u003e\n\u003cp\u003eThe Unicel C-5397 is a pleated polyester cartridge filter element engineered for high-capacity spa and swim-spa applications, providing 80.0 sq ft of filtration area through a high-density Reemay nonwoven polyester media pack. Dimensional specifications: 5-5\/16\" OD, 2-1\/8\" ID at the top opening with a closed bottom end cap, and 17-13\/16\" overall length. Construction features ABS injection-molded end caps with a molded-in top handle for service retrieval, bonded to a perforated polypropylene core for axial rigidity under elevated spa-circulation pressures. Nominal filtration efficiency is 15 microns under standard test conditions. The element is rated for continuous service to 115°F, with intermittent temperature excursions to 120°F acceptable per spa-rated bond specifications. UV-stabilized end cap adhesive resists degradation under sustained bromine and chlorine exposure typical of high-bather-load spa environments.\u003c\/p\u003e\n\u003cp\u003eService interval recommendation for swim-spa and high-volume spa applications: rinse with fresh water every 2–4 weeks; chemical soak (dilute TSP or commercial enzyme cleaner) every 4–6 weeks to remove accumulated body oils, surfactants, and cosmetic residues that resist water rinsing alone. Replacement trigger: ΔP ≥ 5 PSI above clean-filter operating baseline, or 12-month calendar cycle, whichever occurs first; accelerated replacement at 6–9 months recommended for continuously circulated swim-spa installations. Chemical compatibility: polyester fabric and ABS end caps tolerate continuous operation at ≤ 10 ppm free available chlorine or ≤ 30 ppm total bromine; muriatic acid soak at 1:20 dilution compatible for calcium scale removal (20-minute maximum exposure, thorough rinse required). Enzyme cleaners compatible without restriction. Standard Unicel 90-day manufacturing defect warranty applies through authorized distribution.\u003c\/p\u003e\n\u003ch3\u003eWhat's Included\u003c\/h3\u003e\n\u003cp\u003eYour order includes the selected quantity of replacement pool filter cartridges. Each unit is individually inspected for quality before shipping.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Unicel","offers":[{"title":"Default Title","offer_id":42315912314926,"sku":"UNFC5397","price":49.35,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0016\/3453\/3422\/files\/UNFC5397_883c0d57-864b-4750-96e7-2ddc6fad7702.jpg?v=1777663233"},{"product_id":"unicel-c-5423","title":"Unicel C-5423 Replacement Filter for Marquis Spas 03FIL0350 | 34 Sq. Ft.","description":"\u003cdiv class=\"pz-pdp\"\u003e\n\u003ch3\u003eOverview\u003c\/h3\u003e\n\u003cp\u003eThe Unicel C-5423 is a pleated polyester spa filter cartridge providing 34.0 sq ft of effective filtration area, engineered as a direct replacement for the Marquis Spas 03FIL0350 element. Media construction is Reemay nonwoven polyester at a 20-micron nominal filtration rating, configured in a high-pleat-count geometry to maximize surface area within the standard Marquis canister envelope. End caps are ABS injection-molded with a closed bottom and an open-top configuration terminating in a 2-1\/8-inch SAE-thread handle adapter for tool-free extraction. The element is rated for continuous service at temperatures to 115°F with intermittent excursions to 120°F, supporting standard spa circulation pump operating pressures in the 5–15 PSI range.\u003c\/p\u003e\n\u003cp\u003eService interval recommendation for spa applications: fresh-water rinse every 2–4 weeks; chemical soak with dilute TSP or commercial enzyme cleaner every 4–6 weeks to remove accumulated body oils, lotions, and surfactants that resist rinse-only cleaning. Replace at 12-month intervals under typical residential spa duty cycles, or sooner when ΔP rises ≥ 5 PSI above clean-filter operating baseline. Chemical compatibility: polyester media and ABS end caps tolerate continuous operation at ≤ 10 ppm free available chlorine or ≤ 30 ppm total bromine; muriatic acid soak at 1:20 dilution is compatible for calcium scale remediation, with 20-minute maximum exposure followed by thorough fresh-water rinse. Standard Unicel 90-day manufacturer's defect warranty applies through authorized distribution.\u003c\/p\u003e\n\u003ch3\u003eWhat's Included\u003c\/h3\u003e\n\u003cp\u003eYour order includes the selected quantity of replacement spa filter cartridges. Each unit is individually inspected for quality before shipping.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Unicel","offers":[{"title":"Default Title","offer_id":42315912347694,"sku":"UNFC5423","price":37.46,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0016\/3453\/3422\/files\/UNFC5423_bcd1b532-cb74-4ac9-ad85-827763c0cd71.jpg?v=1777663239"},{"product_id":"unicel-c-5626","title":"Unicel C-5626 Replacement Filter for Marquis Spas 03FIL0250 | 25 Sq. Ft.","description":"\u003cdiv class=\"pz-pdp\"\u003e\n\u003ch3\u003eOverview\u003c\/h3\u003e\n\u003cp\u003eThe Unicel C-5626 is a pleated polyester spa filter cartridge engineered for Marquis Spas circulation systems, providing 25.0 sq ft of filtration area through a nonwoven polyester media pack with nominal 15-micron filtration efficiency. The element features molded ABS end caps in a closed-bottom, open-top configuration with a 2-1\/8-inch top opening for standpipe seating; outer diameter measures 5-15\/16 inches, with an overall length of 9-1\/4 inches. Construction includes a perforated polypropylene inner core for axial rigidity under spa pump pressure loading (typical 5–15 PSI operating range). Maximum rated continuous service temperature is 115°F, with intermittent excursions to 120°F within manufacturer tolerance. End cap bond chemistry is formulated for sustained exposure to standard spa water chemistry without delamination.\u003c\/p\u003e\n\u003cp\u003eSpa cartridge service intervals run accelerated relative to pool applications due to elevated bather load per gallon and continuous high-temperature operation. Recommended service cycle: fresh-water rinse every 2–4 weeks; chemical soak in dilute TSP or enzyme degreaser every 4–6 weeks to remove body oils, lotions, and surfactant residue that resist rinsing alone. Replacement is recommended at 12-month intervals for typical residential spa use, or sooner when ΔP rises ≥ 5 PSI above clean-filter baseline. Chemical compatibility: polyester media and ABS end caps tolerate continuous service at ≤ 10 ppm free available chlorine or ≤ 30 ppm total bromine; muriatic acid soak at 1:20 dilution is compatible for calcium scale removal (20-minute maximum exposure, rinse thoroughly). Enzyme cleaner compatible without restriction. Standard Unicel 90-day manufacturer's defect warranty applies through authorized distribution.\u003c\/p\u003e\n\u003ch3\u003eWhat's Included\u003c\/h3\u003e\n\u003cp\u003eYour order includes the selected quantity of replacement spa filter cartridges. Each unit is individually inspected for quality before shipping.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Unicel","offers":[{"title":"Default Title","offer_id":42315912445998,"sku":"UNFC5626","price":40.17,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0016\/3453\/3422\/files\/UNFC5626_9a4b54d5-2d12-4a94-922e-70a44ed9ab87.jpg?v=1777663257"},{"product_id":"unicel-c-7330","title":"Unicel C-7330 Replacement Filter for Master Spas ELE-7330 | 30 Sq. Ft.","description":"\u003cdiv class=\"pz-pdp\"\u003e\n\u003ch3\u003eOverview\u003c\/h3\u003e\n\u003cp\u003eThe Unicel C-7330 is a pleated polyester cartridge filter element engineered for Master Spas residential spa applications, providing 30.0 sq ft of effective filtration area through a Reemay nonwoven polyester media pack at a nominal 15-micron filtration efficiency. Construction specifications include injection-molded ABS end caps in a closed-bottom, open-top (handle-equipped) configuration, with coreless or low-profile core geometry consistent with the Master Spas ELE-7330 form factor. The element is rated for continuous service at temperatures to 104°F with intermittent excursions to 115°F, supporting the operating pressure range of standard residential spa circulation pumps (5–15 PSI typical). End cap bonding withstands sustained exposure to balanced spa water chemistry without delamination or fabric pull-through under standard service conditions.\u003c\/p\u003e\n\u003cp\u003eService interval recommendation: rinse with fresh water every 2–4 weeks; chemical soak in dilute TSP or enzyme cleaner every 4–6 weeks to remove body oils, surfactants, and cosmetic residues that resist mechanical rinsing. Replace at ≤ 12-month intervals under standard residential spa use, or sooner if ΔP rises ≥ 5 PSI above clean-filter operating baseline, fabric tears or channeling are observed, or pleat collapse is documented. Chemical compatibility: polyester media tolerates continuous operation at ≤ 10 ppm free available chlorine or ≤ 30 ppm total bromine; muriatic acid soak at 1:20 dilution compatible for calcium scale removal (20-minute maximum exposure, thorough rinse before reinstallation). Enzyme cleaners compatible without restriction. Standard Unicel 90-day manufacturer's defect warranty applies through authorized distribution.\u003c\/p\u003e\n\u003ch3\u003eWhat's Included\u003c\/h3\u003e\n\u003cp\u003eYour order includes the selected quantity of replacement spa filter cartridges. Each unit is individually inspected for quality before shipping.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Unicel","offers":[{"title":"Default Title","offer_id":42315912708142,"sku":"UNFC7330","price":40.68,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0016\/3453\/3422\/files\/UNFC7330_1b386c4f-09c5-40c0-aae3-e817606d9d35.jpg?v=1777663269"},{"product_id":"unicel-c-7350","title":"Unicel C-7350 Replacement Filter for Caldera Spas 72827 | 50 Sq. Ft.","description":"\u003cdiv class=\"pz-pdp\"\u003e\n\u003ch3\u003eOverview\u003c\/h3\u003e\n\u003cp\u003eThe Unicel C-7350 is a pleated polyester spa cartridge filter element providing 50.0 sq ft of filtration area, engineered as the direct replacement for the Caldera Spas 72827 OEM cartridge. Media construction is Reemay-grade nonwoven polyester with nominal 20-micron filtration efficiency, supported on a closed-core configuration with ABS injection-molded end caps in a closed-bottom, open-top (handle) geometry standard to the Caldera filter housing family. The element is rated for continuous service at spa-application temperatures up to 115°F, with intermittent excursions to 120°F per manufacturer testing. End cap bond chemistry is formulated for sustained immersion in sanitized spa water without delamination, and the pleat pack geometry is optimized for the low-pressure, high-frequency cycling typical of residential spa circulation systems.\u003c\/p\u003e\n\u003cp\u003eService interval recommendation for spa applications: fresh-water rinse every 2–4 weeks; chemical soak in dilute TSP or a dedicated enzyme\/degreaser cartridge cleaner every 4–6 weeks to remove body oils, lotions, and surfactant residues that resist water rinsing alone. Replacement is recommended at 12-month intervals for typical residential use, or earlier when ΔP rises ≥ 5 PSI above the documented clean-filter baseline, when visible fabric degradation occurs, or when chemical cleaning fails to restore flow. Chemical compatibility: polyester media is rated for continuous service at ≤ 10 ppm free available chlorine or ≤ 30 ppm total bromine; muriatic acid soak at 1:20 dilution is compatible for calcium scale removal (20-minute maximum exposure, followed by thorough fresh-water rinse). Enzyme cleaners are compatible without restriction. Standard Unicel 90-day manufacturing defect warranty applies through authorized distribution.\u003c\/p\u003e\n\u003ch3\u003eWhat's Included\u003c\/h3\u003e\n\u003cp\u003eYour order includes the selected quantity of replacement spa filter cartridges. Each unit is individually inspected for quality before shipping.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Unicel","offers":[{"title":"Default Title","offer_id":42315912773678,"sku":"UNFC7350","price":50.51,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0016\/3453\/3422\/files\/1_515e1f7a-0088-4522-b7c2-918c1619c764.png?v=1778968341"},{"product_id":"unicel-c-7375","title":"Unicel C-7375 Replacement Filter for Caldera Spas 72828 | 75 Sq. Ft.","description":"\u003cdiv class=\"pz-pdp\"\u003e\n\u003ch3\u003eOverview\u003c\/h3\u003e\n\u003cp\u003eThe Unicel C-7375 is a pleated polyester spa cartridge filter element providing 75.0 sq ft of filtration area, engineered as a direct OEM replacement for Caldera Spas filter model 72828. The element features Reemay nonwoven polyester media with nominal 15-micron filtration efficiency, supported by injection-molded ABS end caps in a closed-bottom, open-top SAE-thread configuration consistent with Caldera's threaded standpipe manifold design. Internal core construction is rated for the pressure range of residential spa circulation systems (typical 5–15 PSI operating). Maximum continuous service temperature: 104°F, with intermittent excursions to 120°F acceptable per Unicel testing protocol. The 75 sq ft media pack delivers substantial dirt-holding capacity suited to high-bather-load spa applications and extended service intervals between chemical cleanings.\u003c\/p\u003e\n\u003cp\u003eService interval recommendation: rinse with fresh water every 2–4 weeks under normal residential spa use; chemical soak with dilute TSP or commercial enzyme\/degreaser every 4–6 weeks to remove oils, lotions, and surfactant residue that resist water rinsing. Replace at ≤ 12-month intervals under typical use, or earlier when ΔP exceeds 5 PSI above clean-filter baseline, when visual inspection reveals pleat collapse or fabric tears, or when chemical cleaning no longer restores flow. Chemical compatibility: polyester fabric and ABS end caps tolerate continuous service at ≤ 10 ppm free available chlorine or ≤ 30 ppm total bromine; muriatic acid soak at 1:20 dilution is compatible for calcium scale removal (20-minute maximum exposure, followed by thorough freshwater rinse). Verify ozone compatibility before deployment in ozone-primary sanitization systems. Standard Unicel 90-day manufacturer's defect warranty applies through authorized distribution channels.\u003c\/p\u003e\n\u003ch3\u003eWhat's Included\u003c\/h3\u003e\n\u003cp\u003eYour order includes the selected quantity of replacement spa filter cartridges. Each unit is individually inspected for quality before shipping.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Unicel","offers":[{"title":"Default Title","offer_id":42315912806446,"sku":"UNFC7375","price":57.07,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0016\/3453\/3422\/files\/UNFC7375_90de449d-b304-4236-8e1f-c1de02ecef65.jpg?v=1777663280"},{"product_id":"unicel-c-7451","title":"Unicel C-7451 Replacement Filter for Caldera Spas 72826 | 50 Sq. Ft.","description":"\u003cdiv class=\"pz-pdp\"\u003e\n\u003ch3\u003eOverview\u003c\/h3\u003e\n\u003cp\u003eThe Unicel C-7451 is a pleated polyester spa cartridge filter element providing 50.0 sq ft of filtration area, engineered as a direct replacement for Caldera Spas model 72826 filter assemblies. Media construction is Reemay nonwoven polyester with nominal 20-micron filtration efficiency, configured on a reinforced center core with injection-molded end caps. The element features a threaded SAE bottom adapter and handle-style top cap, sized to the standard Caldera large-format housing footprint. End cap bond is rated for continuous service at spa operating temperatures up to 104°F, with intermittent excursions to 120°F per Unicel testing protocol. The 50 sq ft media pack provides extended dirt-holding capacity suited to high-bather-load spa applications and reduced service frequency relative to lower-area equivalents.\u003c\/p\u003e\n\u003cp\u003eService interval recommendation: rinse with fresh water every 2–4 weeks; chemical soak in dilute TSP or commercial enzyme\/degreaser every 4–6 weeks to displace oils, lotions, and surfactant residues that resist water rinsing. Replace at 12–15 month intervals under typical residential spa duty cycles, or earlier if ΔP rises ≥ 5 PSI above clean operating baseline, fabric channeling is observed, or pleat geometry shows permanent deformation. Chemical compatibility: polyester media and ABS end caps tolerate continuous operation at ≤ 10 ppm free available chlorine or ≤ 30 ppm total bromine; muriatic acid soak compatible at 1:20 dilution (20-minute maximum) for calcium scale removal — rinse thoroughly before reinstallation. Avoid ozone-primary sanitization exposure without verifying media compatibility. Standard Unicel 90-day manufacturing defect warranty applies through authorized distribution.\u003c\/p\u003e\n\u003ch3\u003eWhat's Included\u003c\/h3\u003e\n\u003cp\u003eYour order includes the selected quantity of replacement spa filter cartridges. Each unit is individually inspected for quality before shipping.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Unicel","offers":[{"title":"Default Title","offer_id":42315913003054,"sku":"UNFC7451","price":52.82,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0016\/3453\/3422\/files\/UNFC7451_c3b6337c-dc0a-49af-9621-7b3b925f02f8.jpg?v=1777663310"},{"product_id":"unicel-c-7466","title":"Unicel C-7466 Replacement Filter for Sundance Spas 6540-123 | 65 Sq. Ft.","description":"\u003cdiv class=\"pz-pdp\"\u003e\n\u003ch3\u003eOverview\u003c\/h3\u003e\n\u003cp\u003eThe Unicel C-7466 is a pleated polyester spa cartridge filter element providing 65.0 sq ft of filtration area, engineered for high-flow Sundance Spas circulation systems with integrated microfilter media. Media construction is Reemay nonwoven polyester laid up in a high-density pleat pack on a structural polypropylene core, terminated with injection-molded ABS end caps configured for top-load threaded installation. The threaded top end cap features a molded handle and SAE-equivalent thread profile sized to the Sundance MicroClean filter standpipe; the bottom end cap is closed with a centered locator boss. Nominal filtration efficiency is 15 microns under standard test conditions. The element is rated for continuous service to 115°F at spa operating pressures of 5–15 PSI, with end cap adhesive bond verified for elevated-temperature shear performance.\u003c\/p\u003e\n\u003cp\u003eService interval recommendation: rinse with fresh water every 2–4 weeks; chemical soak in dilute TSP or commercial enzyme\/filter cleaner every 4–6 weeks to remove body oils, lotions, and surfactant residue that resist water rinsing alone. Replacement is recommended at 12–15 month intervals under typical residential use, or sooner when ΔP rises ≥ 5 PSI above clean-filter baseline, when fabric channeling or pleat collapse is observed, or when post-cleaning flow recovery falls below 90% of original rated GPM. Chemical compatibility: continuous service at ≤ 10 ppm free available chlorine or ≤ 30 ppm total bromine; muriatic acid soak at 1:20 dilution compatible for calcium scale removal (20-minute maximum exposure, thorough rinse required). ABS end cap construction tolerates standard acid wash protocols. Verify ozone system compatibility before deployment in ozone-primary sanitization installations. Standard Unicel 90-day manufacturer's defect warranty applies through authorized distribution.\u003c\/p\u003e\n\u003ch3\u003eWhat's Included\u003c\/h3\u003e\n\u003cp\u003eYour order includes the selected quantity of replacement spa filter cartridges. Each unit is individually inspected for quality before shipping.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Unicel","offers":[{"title":"Default Title","offer_id":42315913068590,"sku":"UNFC7466","price":63.8,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0016\/3453\/3422\/files\/UNFC7466_a8e16ada-660d-4b3b-8bca-afff3af8be53.jpg?v=1777663322"},{"product_id":"unicel-c-7479","title":"Unicel C-7479 Replacement Filter for Caldera Spas 72830 | 75 Sq. Ft.","description":"\u003cdiv class=\"pz-pdp\"\u003e\n\u003ch3\u003eOverview\u003c\/h3\u003e\n\u003cp\u003eThe Unicel C-7479 is a pleated polyester spa cartridge filter element delivering 75.0 sq ft of filtration area in a high-capacity form factor engineered for Caldera Spas circulation systems and equivalent housings. Media construction is Reemay-grade nonwoven polyester with a nominal 15-micron filtration efficiency, supported by molded ABS end caps and a structural inner core sized for spa-rated operating pressures. The cartridge features a threaded bottom adapter typical of the Caldera 72830 housing series, with the upper end cap configured as a handled closed top for tool-free service extraction. The element is rated for continuous service at temperatures up to 115°F, consistent with portable spa duty cycles, and is dimensionally controlled to ±0.030 inch on critical mating surfaces to ensure bypass-free seating in OEM housings.\u003c\/p\u003e\n\u003cp\u003eService intervals for spa cartridge applications run accelerated relative to pool elements: rinse with fresh water every 2–4 weeks, perform a chemical soak (dilute TSP or enzyme-based cartridge cleaner) every 4–6 weeks to dissolve oils, lotions, and surfactant residue not removed by rinsing, and replace the element at 12–15 months of service or at a ΔP ≥ 5 PSI above clean operating baseline, whichever occurs first. Chemical compatibility: polyester fabric is rated for continuous service at ≤ 10 ppm free available chlorine or ≤ 30 ppm total bromine; muriatic acid wash at 1:20 dilution is compatible for calcium scale remediation, with a maximum 20-minute exposure followed by thorough fresh-water rinse prior to reinstallation. Enzyme cleaners are compatible without restriction. Standard Unicel 90-day manufacturing defect warranty applies through authorized distribution.\u003c\/p\u003e\n\u003ch3\u003eWhat's Included\u003c\/h3\u003e\n\u003cp\u003eYour order includes the selected quantity of replacement spa filter cartridges. Each unit is individually inspected for quality before shipping.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Unicel","offers":[{"title":"Default Title","offer_id":42315913101358,"sku":"UNFC7479","price":59.76,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0016\/3453\/3422\/files\/UNFC7479_85b035d4-ab54-4238-8a30-c20e4bb1313d.jpg?v=1777663327"},{"product_id":"unicel-c-8325","title":"Unicel C-8325 Replacement Filter for Pentair TX-25 | 125 Sq. Ft.","description":"\u003cdiv class=\"pz-pdp\"\u003e\n\u003ch3\u003eOverview\u003c\/h3\u003e\n\u003cp\u003eThe Unicel C-8325 is a pleated polyester cartridge filter element engineered for the Pentair Triton II TX-25 single-cartridge housing platform, delivering 125 sq ft of filtration area through a high-density Reemay nonwoven polyester media pack. Dimensional specifications: 8.5-inch OD, 4.0-inch ID, 23.3125-inch overall length with extended molded ABS end caps configured open-top, open-bottom for standpipe seating in the Triton II canister. Core construction is heavy-wall PVC pipe to support the pressure profile of single-cartridge high-flow residential systems. Rated flow is 125 GPM at 15 PSI clean differential, with operating pressure capacity to 50 PSI and continuous service temperature to 104°F. Nominal filtration efficiency is 20 microns under standard test conditions, sized for full-flow turnover on pool volumes up to 35,000 gallons at industry-standard 6-hour turnover targets.\u003c\/p\u003e\n\u003cp\u003eService interval recommendation: rinse at ΔP ≥ 8 PSI above clean-filter operating baseline, with full chemical soak (TSP or enzyme cleaner, 12-hour minimum dwell) every 3–6 months depending on bather load and source water hardness. Annual replacement is recommended, or sooner if fabric channeling, pleat collapse, or end cap separation is observed during inspection. The element is compatible with muriatic acid wash at 1:20 dilution (20-minute maximum exposure) for calcium scale removal; rinse thoroughly before reinstallation and verify post-installation pressure against documented clean baseline. Polyester media tolerates continuous service at ≤ 10 ppm free available chlorine and standard bromine sanitization; enzyme cleaners are compatible without restriction. ABS end cap construction is fully compatible with standard acid wash procedures. Standard Unicel 90-day manufacturing defect warranty applies through authorized distribution.\u003c\/p\u003e\n\u003ch3\u003eWhat's Included\u003c\/h3\u003e\n\u003cp\u003eYour order includes the selected quantity of replacement pool filter cartridges. Each unit is individually inspected for quality before shipping.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Unicel","offers":[{"title":"Default Title","offer_id":42315913822254,"sku":"UNFC8325","price":81.62,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0016\/3453\/3422\/files\/UNFC8325_0881c46a-8009-4ec1-b2ef-70f65f7b0c0f.jpg?v=1777663423"},{"product_id":"unicel-c-8326","title":"Unicel C-8326 Replacement Filter for Sundance Spas 6473-168 | 125 Sq. Ft.","description":"\u003cdiv class=\"pz-pdp\"\u003e\n\u003ch3\u003eOverview\u003c\/h3\u003e\n\u003cp\u003eThe Unicel C-8326 is a pleated polyester spa cartridge filter element providing 125 sq ft of effective filtration area, engineered for high-capacity Sundance Spas circulation systems. The element is constructed with Reemay-grade nonwoven polyester media in a high-pleat-count configuration, mated to injection-molded ABS end caps for chemical and thermal stability under continuous spa-duty service. Nominal filtration efficiency is rated at 15 microns under standard test conditions. The cartridge is constructed on a structural inner core sized for direct standpipe seating in OEM Sundance manifolds, with end cap geometry held to ±0.030 inch tolerance for bypass-free fitment. Maximum rated continuous service temperature is 104°F, with intermittent excursions to 120°F acceptable per spa-rated element protocol. The 125 sq ft media pack supports extended service intervals relative to lower-area cartridges by distributing particulate load across greater surface area, reducing ΔP rise rate under typical bather loading.\u003c\/p\u003e\n\u003cp\u003eService interval recommendation: rinse with fresh water every 2–4 weeks to remove surface particulate; chemical soak in dilute TSP or commercial enzyme\/cartridge cleaner every 4–6 weeks to address oils, lotions, and surfactant residue resistant to mechanical rinsing. Replace the element at ΔP ≥ 5 PSI above clean operating baseline, or on a 12–15 month calendar cycle under typical residential spa loading — whichever occurs first. Heavy-use or commercial-spa applications warrant accelerated replacement at 6–9 month intervals. Chemical compatibility: continuous service at ≤ 10 ppm free available chlorine or ≤ 30 ppm total bromine; muriatic acid soak at 1:20 dilution compatible for calcium scale removal (20-minute maximum exposure, thorough rinse before reinstallation). Enzyme cleaners compatible without restriction. Standard Unicel 90-day manufacturing defect warranty applies through authorized distribution.\u003c\/p\u003e\n\u003ch3\u003eWhat's Included\u003c\/h3\u003e\n\u003cp\u003eYour order includes the selected quantity of replacement spa filter cartridges. Each unit is individually inspected for quality before shipping.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Unicel","offers":[{"title":"Default Title","offer_id":42315913855022,"sku":"UNFC8326","price":83.2,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0016\/3453\/3422\/files\/UNFC8326_a640f35a-49dd-4c87-97e0-09f9bdce464b.jpg?v=1777663430"},{"product_id":"unicel-c-8341","title":"Unicel C-8341 Filter for Master Spas ELE-8341 (Eco-Pur outer) | 40 Sq. Ft.","description":"\u003cdiv class=\"pz-pdp\"\u003e\n\u003ch3\u003eOverview\u003c\/h3\u003e\n\u003cp\u003eThe Unicel C-8341 is a pleated polyester spa cartridge filter element engineered as the outer component of the Master Spas Eco-Pur dual-stage filtration assembly, delivering 40.0 sq ft of filtration area through a high-pleat-count Reemay nonwoven polyester media pack. Nominal filtration efficiency is rated at 20 microns under standard test conditions. The element features ABS injection-molded end caps with proprietary mating geometry specific to the Master Spas Eco-Pur housing architecture, supporting a coaxial inner-element configuration. End cap bonding adhesive is UV-stabilized and rated for continuous service at spa operating temperatures up to 115°F, with intermittent excursions to 120°F. The element is rated for continuous operation within the 5–15 PSI pressure range typical of residential spa circulation systems.\u003c\/p\u003e\n\u003cp\u003eService interval recommendation: rinse with fresh water every 2–4 weeks under standard residential bather load; chemical soak (dilute TSP or commercial enzyme cleaner) every 4–6 weeks to remove body oils, lotions, and surfactant residues that resist water-only rinsing. Replace the element at 12–15 month intervals for typical residential use, or upon ΔP rise ≥ 5 PSI above clean-filter baseline, whichever occurs first. The inner Eco-Pur core element should be replaced on its own manufacturer-specified cycle independent of the outer cartridge. Chemical compatibility: polyester fabric and ABS end caps tolerate continuous operation at ≤ 10 ppm free available chlorine or ≤ 30 ppm total bromine; muriatic acid soak at 1:20 dilution is compatible for calcium scale remediation (20 minutes maximum exposure, followed by thorough fresh-water rinse). Enzyme cleaners are compatible without restriction. Standard Unicel 90-day manufacturing defect warranty applies through authorized distribution.\u003c\/p\u003e\n\u003ch3\u003eWhat's Included\u003c\/h3\u003e\n\u003cp\u003eYour order includes the selected quantity of replacement spa filter cartridges. Each unit is individually inspected for quality before shipping.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Unicel","offers":[{"title":"Default Title","offer_id":42315913887790,"sku":"UNFC8341","price":46.15,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0016\/3453\/3422\/files\/UNFC8341_f7e7976a-68dc-492d-95b8-27cf7eac8c3a.jpg?v=1777663436"},{"product_id":"unicel-c-8350","title":"Unicel C-8350 Replacement Filter for Pentair TX-35 | 50 Sq. Ft.","description":"\u003cdiv class=\"pz-pdp\"\u003e\n\u003ch3\u003eOverview\u003c\/h3\u003e\n\u003cp\u003eThe Unicel C-8350 is a pleated polyester cartridge filter element engineered for Pentair TX-35 residential and light commercial pool filtration systems, delivering 50.0 sq ft of effective filtration area through a Reemay nonwoven polyester media pack on a rigid PVC core assembly. Dimensional specifications: 7.0-inch OD, 2.0-inch ID open top, 18.3125-inch overall length with molded ABS end caps configured for a closed-bottom, open-top mounting orientation. Nominal filtration efficiency is 20 microns under standard test conditions. Rated flow capacity is 50 GPM at clean operating differential, with continuous service rated to 104°F and operating pressures to 50 PSI. End cap geometry is held to ±0.030 inch on the seating surfaces to ensure positive bypass-free seal in OEM housings.\u003c\/p\u003e\n\u003cp\u003eService interval recommendation: residential installations — pressure-differential-based replacement triggered at ΔP ≥ 8–10 PSI above clean-filter operating baseline, or on an annual calendar cycle, whichever occurs first. Rinse cycle every 4–6 weeks under standard bather load; chemical soak with TSP or enzyme cleaner every 3–6 months to address oils, surfactants, and organic loading that resist standard rinse procedures. Acid wash compatibility: muriatic acid at 1:20 dilution, 20-minute maximum exposure, for calcium scale remediation; rinse thoroughly prior to reinstallation. Chlorine tolerance: continuous service at ≤ 10 ppm free available chlorine; bromine compatible without restriction. ABS end cap construction is compatible with standard acid wash procedures; urethane bonding agents are not used on this element. Post-installation, verify operating pressure against clean baseline and document for service log. Standard Unicel 90-day manufacturing defect warranty applies through authorized distribution.\u003c\/p\u003e\n\u003ch3\u003eWhat's Included\u003c\/h3\u003e\n\u003cp\u003eYour order includes the selected quantity of replacement pool filter cartridges. Each unit is individually inspected for quality before shipping.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Unicel","offers":[{"title":"Default Title","offer_id":42315913920558,"sku":"UNFC8350","price":49.27,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0016\/3453\/3422\/files\/UNFC8350_30f13986-9f23-4c86-b364-eddb4b0b771b.jpg?v=1777663442"},{"product_id":"unicel-c-8380","title":"Unicel C-8380 Filter for Sundance Spas 6540-487 (Microclean) | 80 Sq. Ft.","description":"\u003cdiv class=\"pz-pdp\"\u003e\n\u003ch3\u003eOverview\u003c\/h3\u003e\n\u003cp\u003eThe Unicel C-8380 is a pleated polyester spa filter cartridge engineered for the Sundance Spas Microclean filtration system, delivering 80.0 sq ft of total filtration media surface area in a high-capacity element configuration. Media construction utilizes Reemay-class nonwoven polyester with nominal 15-micron filtration efficiency, supported by injection-molded ABS end caps designed to the OEM Microclean manifold geometry. The element is rated for continuous spa service at temperatures up to 104°F and operating pressures within the typical 5–15 PSI envelope of residential spa circulation systems. The 80 sq ft media pack provides extended dirt-holding capacity between service cycles, supporting reduced ΔP rise rates under elevated bather load conditions characteristic of high-use spa installations.\u003c\/p\u003e\n\u003cp\u003eSpa filter service intervals are accelerated relative to pool cartridge applications: fresh-water rinse every 2–4 weeks; chemical soak in dilute TSP or enzyme cleaner every 4–6 weeks to remove body oils, lotions, and surfactant residues that resist water rinsing alone. Replacement is recommended at 12-month intervals under normal residential spa use, or sooner when ΔP rises ≥ 5 PSI above clean-filter baseline, when visible fabric degradation occurs, or when chemical cleaning no longer restores flow. Chemical compatibility: polyester media tolerates continuous operation at ≤ 10 ppm free available chlorine or ≤ 30 ppm total bromine; muriatic acid soak at 1:20 dilution is compatible for calcium scale removal (20-minute maximum exposure, thorough rinse before reinstallation). Enzyme cleaners are compatible without restriction. Standard Unicel 90-day manufacturer defect warranty applies through authorized distribution.\u003c\/p\u003e\n\u003ch3\u003eWhat's Included\u003c\/h3\u003e\n\u003cp\u003eYour order includes the selected quantity of replacement spa filter cartridges. Each unit is individually inspected for quality before shipping.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Unicel","offers":[{"title":"Default Title","offer_id":42315914739758,"sku":"UNFC8380","price":64.37,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0016\/3453\/3422\/files\/UNFC8380_c2e5b3cf-ca29-4fac-8816-845946c53272.jpg?v=1777663448"},{"product_id":"unicel-c-8399","title":"Unicel C-8399 Replacement Filter for Caldera Spas 72831","description":"\u003cdiv class=\"pz-pdp\"\u003e\n\u003ch3\u003eOverview\u003c\/h3\u003e\n\u003cp\u003eThe Unicel C-8399 is a pleated polyester spa cartridge filter element engineered for Caldera Spas circulation systems, providing 100 sq ft of filtration area in a single-element configuration. Dimensional specifications: 8.0-inch OD, 4.0-inch ID at the open top end, with an overall length of 9.75 inches. Media construction utilizes Reemay nonwoven spunbond polyester at a nominal 20-micron filtration efficiency, supported on a perforated PVC core for axial rigidity under spa pump operating pressures. End cap configuration features a closed-bottom, open-top molded ABS design with a 4-inch SAE-style top opening for direct manifold seating. Maximum continuous service temperature is rated at 115°F with intermittent excursion capability to 120°F, suitable for the elevated thermal duty cycle characteristic of high-use spa applications. Operating pressure range: 5–25 PSI.\u003c\/p\u003e\n\u003cp\u003eService interval recommendation: rinse with fresh water every 2–4 weeks to remove gross particulate loading; perform chemical soak with dilute TSP or commercial enzyme cleaner every 4–6 weeks to displace accumulated body oils, surfactants, and cosmetic residues that resist rinse-only maintenance. Replacement is recommended at 12–15 month intervals under typical residential spa use, or at ΔP ≥ 5 PSI above clean operating baseline, whichever occurs first. Chemical compatibility: polyester media and ABS end caps tolerate continuous service at ≤ 10 ppm free available chlorine or ≤ 30 ppm total bromine; muriatic acid wash at 1:20 dilution is compatible for calcium scale removal (20-minute maximum exposure, thorough fresh water rinse required prior to reinstallation). Enzyme cleaners are compatible without restriction. Standard Unicel 90-day manufacturing defect warranty applies through authorized distribution.\u003c\/p\u003e\n\u003ch3\u003eWhat's Included\u003c\/h3\u003e\n\u003cp\u003eYour order includes the selected quantity of replacement spa filter cartridges. Each unit is individually inspected for quality before shipping.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Unicel","offers":[{"title":"Default Title","offer_id":42315914772526,"sku":"UNFC8399","price":68.48,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0016\/3453\/3422\/files\/UNFC8399_ed16d7e0-1940-4333-83b8-6cd1c7cbf008.jpg?v=1777663454"},{"product_id":"unicel-c-8450","title":"Unicel C-8450 Replacement Filter for Coleman 103-3298 | 50 Sq. Ft.","description":"\u003cdiv class=\"pz-pdp\"\u003e\n\u003ch3\u003eOverview\u003c\/h3\u003e\n\u003cp\u003eThe Unicel C-8450 is a pleated polyester spa cartridge filter element providing 50.0 sq ft of effective filtration area through a high-density Reemay nonwoven polyester media pack. Dimensional specifications: 6.0-inch OD, 2.0-inch ID with SAE 1.5-inch threaded bottom fitting, 14.875-inch length overall. Construction features ABS injection-molded end caps with a threaded closed-bottom configuration and open-flow top, supporting the screw-in mounting style standard to Coleman\/Maax spa filter wells. Nominal filtration efficiency is 20 microns. The element is rated for continuous service to 104°F with intermittent excursions to 120°F, and operating pressures appropriate to residential spa circulation systems (typical 5–25 PSI). End cap bond chemistry is formulated for sustained immersion at elevated water temperature without delamination.\u003c\/p\u003e\n\u003cp\u003eService interval recommendation: rinse with fresh water every 2–4 weeks; chemical soak in dilute TSP or commercial enzyme cleaner every 4–6 weeks to remove body oils, surfactants, and cosmetic residues that resist rinsing alone. Replace at 12–15 month intervals under typical residential use, or sooner if ΔP rises ≥ 5 PSI above clean-filter operating baseline, fabric tears or channeling are visible, or pleat geometry shows crushing or delamination. Chemical compatibility: polyester fabric and ABS end caps tolerate continuous service at ≤ 10 ppm free available chlorine or ≤ 30 ppm total bromine; muriatic acid soak (1:20 dilution, 20-minute maximum exposure) compatible for calcium scale remediation; enzyme cleaners compatible without restriction. Verify threaded bottom fitting hand-tight plus quarter-turn at installation and confirm pressure stabilization before returning the spa to service. Standard Unicel 90-day manufacturing defect warranty applies through authorized distribution.\u003c\/p\u003e\n\u003ch3\u003eWhat's Included\u003c\/h3\u003e\n\u003cp\u003eYour order includes the selected quantity of replacement spa filter cartridges. Each unit is individually inspected for quality before shipping.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Unicel","offers":[{"title":"Default Title","offer_id":42315915264046,"sku":"UNFC8450","price":49.27,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0016\/3453\/3422\/files\/UNFC8450_27bfe90f-3754-45e1-9cc3-1b9cfd4f8480.jpg?v=1777663495"},{"product_id":"unicel-c-8475","title":"Unicel C-8475 Replacement Filter for Coleman 103-3299 | 75 Sq. Ft.","description":"\u003cdiv class=\"pz-pdp\"\u003e\n\u003ch3\u003eOverview\u003c\/h3\u003e\n\u003cp\u003eThe Unicel C-8475 is a pleated polyester cartridge filter element engineered for above-ground spa and portable spa circulation systems, providing 75.0 sq ft of filtration area through a high-pleat-count Reemay nonwoven polyester media pack. Dimensional specifications align with the Coleman\/Maax 103-3299 form factor, with ABS injection-molded end caps configured for threaded-base seating to mate with the spa's integrated filter standpipe assembly. Media nominal filtration efficiency is rated at 15 microns under standard test conditions. End cap bond is formulated for sustained service at elevated spa operating temperatures, with continuous-duty rating to 104°F and short-duration tolerance to 120°F per Unicel testing protocol. The element's high sq ft rating delivers extended dirt-holding capacity between service cycles, reducing pressure-driven service frequency in high-bather-load portable spa applications.\u003c\/p\u003e\n\u003cp\u003eService interval recommendation for portable spa applications: rinse with fresh water every 2–4 weeks; chemical soak in dilute TSP or enzyme cleaner every 4–6 weeks to remove accumulated body oils, lotions, and surfactants that fresh-water rinsing alone will not displace. Replace cartridge at 12-month intervals under typical residential spa use, or earlier when ΔP rises ≥ 5 PSI above clean-filter operating baseline. Chemical compatibility: polyester media and ABS end caps tolerate continuous operation at ≤ 10 ppm free available chlorine or ≤ 30 ppm total bromine. Muriatic acid wash at 1:20 dilution is compatible for calcium scale removal (20-minute maximum exposure, followed by thorough fresh-water rinse). Enzyme cleaners are compatible without restriction. Standard Unicel 90-day manufacturing defect warranty applies through authorized distribution.\u003c\/p\u003e\n\u003ch3\u003eWhat's Included\u003c\/h3\u003e\n\u003cp\u003eYour order includes the selected quantity of replacement spa filter cartridges. Each unit is individually inspected for quality before shipping.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Unicel","offers":[{"title":"Default Title","offer_id":42315915329582,"sku":"UNFC8475","price":57.35,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0016\/3453\/3422\/files\/UNFC8475_c1f84353-8af0-4f44-a64e-7c2cfa22d57d.jpg?v=1777663507"},{"product_id":"unicel-4ch-20","title":"Unicel 4CH-20 Replacement Filter for Saratoga Spas PHC25P4 | 20 Sq. Ft.","description":"\u003cdiv class=\"pz-pdp\"\u003e\n\u003ch3\u003eOverview\u003c\/h3\u003e\n\u003cp\u003eThe Unicel 4CH-20 is a pleated polyester spa cartridge filter element providing 20.0 sq ft of filtration area in a compact form factor engineered for high-bather-load spa circulation systems. Construction consists of Reemay nonwoven polyester media at nominal 20-micron filtration efficiency, supported on a perforated polypropylene core with injection-molded ABS end caps configured in a closed-bottom, open-top geometry typical of Saratoga-family threaded handle cartridges. The element is rated for continuous service to 115°F with intermittent excursions to 120°F, suitable for the operating pressure envelope of residential spa pumps (typical 5–15 PSI clean differential). End cap adhesive is UV-stabilized and chemically resistant to standard spa sanitizer chemistries.\u003c\/p\u003e\n\u003cp\u003eService interval recommendation: rinse with fresh water every 2–4 weeks; chemical soak in dilute TSP or enzyme cleaner every 4–6 weeks to remove accumulated body oils, lotions, and surfactants that resist water rinsing alone. Replace at ≤ 3-month intervals for daily-use spas or at ΔP ≥ 5 PSI above clean operating baseline, whichever occurs first; ≤ 6-month intervals are acceptable for seasonal or low-utilization installations. Chemical compatibility: polyester fabric and ABS end caps tolerate continuous service at ≤ 10 ppm free available chlorine or ≤ 30 ppm total bromine; muriatic acid soak at 1:20 dilution is compatible for calcium scale removal (20-minute maximum exposure, thorough rinse required before reinstallation). Enzyme cleaner compatible without restriction. Standard Unicel 90-day manufacturer's defect warranty applies through authorized distribution.\u003c\/p\u003e\n\u003ch3\u003eWhat's Included\u003c\/h3\u003e\n\u003cp\u003eYour order includes the selected quantity of replacement spa filter cartridges. Each unit is individually inspected for quality before shipping.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Unicel","offers":[{"title":"Default Title","offer_id":42315916476462,"sku":"UNF4CH20","price":33.2,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0016\/3453\/3422\/files\/UNF4CH20_ad59afd9-61c5-4d02-bc52-04f983a640fc.jpg?v=1777663665"},{"product_id":"unicel-4ch-21","title":"Unicel 4CH-21 Replacement Filter for Various PTL18P4 | 19 Sq. Ft.","description":"\u003cdiv class=\"pz-pdp\"\u003e\n\u003ch3\u003eOverview\u003c\/h3\u003e\n\u003cp\u003eThe Unicel 4CH-21 is a pleated polyester cartridge filter element configured for top-load spa filtration applications, providing 19.0 sq ft of filtration area via a Reemay nonwoven polyester media pack. Dimensional specifications: 4-9\/16-inch OD, 2-1\/8-inch open top with handle, 9-3\/4-inch overall length; bottom end cap is ABS injection-molded in a closed-bottom configuration matched to top-load standpipe seating. Media specification is nominal 15-micron filtration efficiency at standard test conditions, with pleat geometry optimized for the low-flow, high-temperature operating envelope characteristic of residential spa circulation pumps. Rated continuous service temperature: 104°F, with intermittent excursions to 120°F acceptable. End cap bond chemistry is rated for continuous immersion in standard spa water chemistry.\u003c\/p\u003e\n\u003cp\u003eService interval recommendation: spa applications require accelerated maintenance cycles relative to pool elements. Rinse with fresh water every 2–4 weeks; chemical soak in dilute TSP or commercial enzyme cleaner every 4–6 weeks to displace body oils, lotions, and surfactant accumulation that resists water rinsing alone. Replace at ≤ 3-month intervals for daily-use spas and ≤ 6-month intervals for seasonal use; ΔP replacement trigger is ≥ 5 PSI above clean operating baseline. Chemical compatibility: continuous service rated at ≤ 10 ppm free available chlorine or ≤ 30 ppm total bromine; muriatic acid wash at 1:20 dilution (20 minutes maximum exposure) compatible for calcium scale removal, followed by thorough fresh-water rinse. Enzyme cleaner compatible without restriction. Standard Unicel 90-day manufacturing defect warranty applies through authorized distribution.\u003c\/p\u003e\n\u003ch3\u003eWhat's Included\u003c\/h3\u003e\n\u003cp\u003eYour order includes the selected quantity of replacement pool filter cartridges. Each unit is individually inspected for quality before shipping.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Unicel","offers":[{"title":"Default Title","offer_id":42315916574766,"sku":"UNF4CH21","price":34.9,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0016\/3453\/3422\/files\/UNF4CH21_c00b6b2c-9448-437e-81a9-37b6fdb94670.jpg?v=1777663671"},{"product_id":"unicel-4ch-23","title":"Unicel 4CH-23 Replacement Filter for Freeflow Spas CLX (1-1 | 25 Sq. Ft.","description":"\u003cdiv class=\"pz-pdp\"\u003e\n\u003ch3\u003eOverview\u003c\/h3\u003e\n\u003cp\u003eThe Unicel 4CH-23 is a pleated polyester spa cartridge filter element providing 25.0 sq ft of filtration area in a compact threaded-base configuration engineered for Freeflow Spas CLX-series filter housings. Construction features Reemay nonwoven polyester media on injection-molded ABS end caps, with a 1-1\/2\" MPT (male pipe thread) bottom fitting and closed top end cap for direct standpipe mounting. Nominal filtration efficiency is rated at 20 microns under standard test conditions. The element is rated for continuous service at temperatures up to 104°F, with intermittent excursions to 120°F acceptable for spa-duty applications. ABS end cap bond geometry maintains dimensional tolerance within ±0.030 inch at the threaded interface for confirmed bypass-free seating against the housing manifold.\u003c\/p\u003e\n\u003cp\u003eService interval recommendation: rinse with fresh water every 2–4 weeks under typical residential spa loading; chemical soak (dilute TSP or commercial enzyme cleaner) every 4–6 weeks to remove accumulated body oils, lotions, and surfactants that resist water rinsing. Replace at 12-month intervals or upon ΔP rise ≥ 5 PSI above clean operating baseline, whichever occurs first. Thread the element hand-tight into the housing manifold; do NOT apply pipe wrench torque to the MPT base, as overtightening will fracture the ABS end cap. Chemical compatibility: polyester fabric and ABS end caps tolerate continuous service at ≤ 10 ppm free available chlorine or equivalent bromine sanitization; muriatic acid wash (1:20 dilution, 20-minute maximum soak) compatible for calcium scale removal. Standard Unicel 90-day manufacturing defect warranty applies through authorized distribution.\u003c\/p\u003e\n\u003ch3\u003eWhat's Included\u003c\/h3\u003e\n\u003cp\u003eYour order includes the selected quantity of replacement spa filter cartridges. Each unit is individually inspected for quality before shipping.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Unicel","offers":[{"title":"Default Title","offer_id":42315916771374,"sku":"UNF4CH23","price":35.51,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0016\/3453\/3422\/files\/UNF4CH23_83116808-f75d-4296-97a3-002e70c225d6.jpg?v=1777663677"},{"product_id":"unicel-4ch-24","title":"Unicel 4CH-24 Replacement Filter for LA Spas PTL25P-4 | 25 Sq. Ft.","description":"\u003cdiv class=\"pz-pdp\"\u003e\n\u003ch3\u003eOverview\u003c\/h3\u003e\n\u003cp\u003eThe Unicel 4CH-24 is a pleated polyester spa cartridge filter element providing 25.0 sq ft of effective filtration area through a Reemay nonwoven polyester media pack with nominal 15-micron filtration efficiency. Dimensional specifications: 4-15\/16 inch OD, 2-1\/8 inch ID, 9-1\/4 inch length, with a top handle and threaded SAE bottom fitting (1-1\/2 inch MPT) configured for screw-in mount housings. End cap construction is ABS injection-molded, bonded to a perforated polypropylene core that delivers axial rigidity across the operating pressure range of standard spa circulation pumps (5–25 PSI). Maximum rated continuous service temperature is 104°F with intermittent excursion capacity to 115°F. The threaded base provides a positive, bypass-free seat without supplemental gasket hardware.\u003c\/p\u003e\n\u003cp\u003eService interval recommendation: rinse with fresh water every 2–4 weeks under typical residential spa use; chemical soak with dilute TSP or commercial cartridge cleaner every 4–6 weeks to remove oils, lotions, and biofilm residues that resist mechanical rinsing. Replace at ≤ 12-month intervals for standard residential service, or on ΔP trigger of ≥ 5 PSI above clean baseline, whichever occurs first. Install hand-tight on threaded base — do NOT apply tool torque, as overtightening risks end-cap deformation. Chemical compatibility: polyester media and ABS end caps tolerate continuous service at ≤ 10 ppm free available chlorine or ≤ 30 ppm total bromine; muriatic acid wash at 1:20 dilution is compatible for calcium scale removal (20-minute maximum soak, thorough freshwater rinse before reinstallation). Enzyme cleaners are compatible without restriction. Standard Unicel 90-day manufacturing defect warranty applies through authorized distribution.\u003c\/p\u003e\n\u003ch3\u003eWhat's Included\u003c\/h3\u003e\n\u003cp\u003eYour order includes the selected quantity of replacement spa filter cartridges. Each unit is individually inspected for quality before shipping.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Unicel","offers":[{"title":"Default Title","offer_id":42315916804142,"sku":"UNF4CH24","price":34.98,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0016\/3453\/3422\/files\/UNF4CH24_9359b72d-e45d-4152-a266-c144a454d4ad.jpg?v=1777663683"},{"product_id":"unicel-4ch-30","title":"Unicel 4CH-30 Replacement Filter for LA Spas PTL25P4 (11-7 | 30 Sq. Ft.","description":"\u003cdiv class=\"pz-pdp\"\u003e\n\u003ch3\u003eOverview\u003c\/h3\u003e\n\u003cp\u003eThe Unicel 4CH-30 is a pleated polyester spa cartridge filter element providing 30.0 sq ft of filtration area in a compact, threaded-base configuration engineered for top-load spa filter housings. Dimensional specifications: 4-15\/16-inch OD, 11-7\/8-inch overall length, with a molded ABS bottom end cap featuring an integrated 1-1\/2-inch MPT (male pipe thread) connection and a closed top handle end cap for single-point service removal. Media construction is Reemay-spec nonwoven polyester at nominal 20-micron filtration efficiency, supported on a structural PVC core with UV-stabilized end cap adhesive rated for continuous service at temperatures up to 115°F. Operating pressure range: 5–15 PSI typical for spa circulation pump applications, with end cap bond integrity verified through standard ASTM shear testing at elevated temperature.\u003c\/p\u003e\n\u003cp\u003eService interval recommendation for spa applications: rinse with fresh water every 2–4 weeks; chemical soak in dilute TSP or commercial enzyme cleaner every 4–6 weeks to remove accumulated body oils, lotions, and surfactant residue that resist standard rinsing. Replace at 12-month intervals under typical residential spa duty cycles, or earlier if ΔP rises ≥ 5 PSI above clean operating baseline, if visible pleat collapse or fabric channeling is observed, or if thread integrity at the ABS base shows wear. Chemical compatibility: polyester media tolerates continuous service at ≤ 10 ppm free available chlorine or ≤ 30 ppm total bromine; muriatic acid soak at 1:20 dilution is compatible for calcium scale remediation (20-minute maximum exposure, followed by thorough fresh-water rinse). Enzyme cleaners compatible without restriction. Standard Unicel 90-day manufacturing defect warranty applies through authorized distribution channels.\u003c\/p\u003e\n\u003ch3\u003eWhat's Included\u003c\/h3\u003e\n\u003cp\u003eYour order includes the selected quantity of replacement spa filter cartridges. Each unit is individually inspected for quality before shipping.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Unicel","offers":[{"title":"Default Title","offer_id":42315916902446,"sku":"UNF4CH30","price":35.79,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0016\/3453\/3422\/files\/UNF4CH30_5e8197f6-9ae4-4aa0-b350-f8f2813cc827.jpg?v=1777663689"},{"product_id":"unicel-4ch-50","title":"Unicel 4CH-50 Replacement Filter for LA Spas PTL50P4 (14-3 | 50 Sq. Ft.","description":"\u003cdiv class=\"pz-pdp\"\u003e\n\u003ch3\u003eOverview\u003c\/h3\u003e\n\u003cp\u003eThe Unicel 4CH-50 is a pleated polyester cartridge filter element providing 50 sq ft of filtration area in a compact spa-form-factor configuration, engineered for LA Spas and compatible 4-9\/16-inch OD housings. Media construction utilizes Reemay-grade nonwoven polyester at nominal 15-micron filtration efficiency, supported by a perforated polypropylene core for axial rigidity under spa pump operating loads. Dimensional specifications: 4-9\/16-inch OD, 2-1\/8-inch ID, 14-3\/4-inch length, with closed-bottom and open-top ABS injection-molded end caps featuring a 2-1\/8-inch top hole and 2-inch bottom configuration. The element is rated for continuous service to 115°F, with operating pressure tolerance up to 25 PSI. The high pleat density delivers extended dirt-holding capacity relative to spa-class cartridges in this dimensional family, supporting longer service cycles between chemical soaks.\u003c\/p\u003e\n\u003cp\u003eService interval recommendation: rinse with fresh water every 2–4 weeks; chemical soak in dilute TSP or enzyme cleaner every 4–6 weeks to remove body oils, lotions, and surfactant residues that resist water rinsing alone. Replace at 12–15 month intervals under typical residential spa use, or sooner if ΔP rises ≥ 5 PSI above clean-filter operating baseline, with fabric tears, pleat channeling, or end cap separation also triggering replacement. Chemical compatibility: polyester media and ABS end caps tolerate continuous operation at ≤ 10 ppm free available chlorine or ≤ 30 ppm total bromine; muriatic acid soak at 1:20 dilution compatible for calcium scale removal (20-minute maximum exposure, thorough rinse required). Enzyme cleaner compatible without restriction. Standard Unicel 90-day manufacturing defect warranty applies through authorized distribution.\u003c\/p\u003e\n\u003ch3\u003eWhat's Included\u003c\/h3\u003e\n\u003cp\u003eYour order includes the selected quantity of replacement spa filter cartridges. Each unit is individually inspected for quality before shipping.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Unicel","offers":[{"title":"Default Title","offer_id":42315916967982,"sku":"UNF4CH50","price":44.56,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0016\/3453\/3422\/files\/UNF4CH50_167c3c76-81c6-48db-a83a-c03600801e95.jpg?v=1777663694"},{"product_id":"unicel-4ch-925","title":"Unicel 4CH-925 Replacement Filter for Saratoga Spas PSANT20P3 | 20 Sq. Ft.","description":"\u003cdiv class=\"pz-pdp\"\u003e\n\u003ch3\u003eOverview\u003c\/h3\u003e\n\u003cp\u003eThe Unicel 4CH-925 is a pleated polyester spa cartridge filter element providing 20.0 sq ft of effective filtration area, engineered for replacement service in Saratoga Spas PSANT20P3 (Futura Antigua) housings and dimensionally equivalent spa circulation systems. Construction features Reemay-grade nonwoven polyester media with nominal 20-micron filtration efficiency, terminated in ABS injection-molded end caps configured with a closed bottom and open-flow top for top-load manifold seating. Coreless pleat-pack geometry is optimized for the low-pressure operating range typical of residential spa pumps (5–15 PSI). The element is rated for continuous service at temperatures up to 104°F, with intermittent excursions to 115°F acceptable per Unicel testing protocol. End cap adhesive bond is UV-stabilized and resistant to standard spa water chemistry.\u003c\/p\u003e\n\u003cp\u003eSpa service intervals for the 4CH-925: fresh-water rinse every 2–4 weeks; chemical soak with dilute TSP or enzyme degreaser every 4–6 weeks to remove body oils, lotions, and surfactant residue that resist standard rinsing. Replace element at ≤ 12-month intervals under typical residential spa duty cycles, or sooner when ΔP rises ≥ 5 PSI above clean operating baseline. Chemical compatibility: polyester media and ABS end caps tolerate continuous service at ≤ 10 ppm free available chlorine or ≤ 30 ppm total bromine; muriatic acid wash at 1:20 dilution (20-minute maximum soak) is compatible for calcium scale removal — rinse thoroughly before reinstallation. Enzyme cleaners compatible without restriction. Standard Unicel 90-day manufacturing defect warranty applies through authorized distribution.\u003c\/p\u003e\n\u003ch3\u003eWhat's Included\u003c\/h3\u003e\n\u003cp\u003eYour order includes the selected quantity of replacement spa filter cartridges. Each unit is individually inspected for quality before shipping.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Unicel","offers":[{"title":"Default Title","offer_id":42315917033518,"sku":"UNF4CH925","price":33.59,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0016\/3453\/3422\/files\/UNF4CH925_2d448031-67ec-40ae-85db-c120222dffd6.jpg?v=1777663700"},{"product_id":"unicel-4ch-926","title":"Unicel 4CH-926 Filter for Waterway 500-0014-P (25 sq ft SAE) | 25 Sq. Ft.","description":"\u003cdiv class=\"pz-pdp\"\u003e\n\u003ch3\u003eOverview\u003c\/h3\u003e\n\u003cp\u003eThe Unicel 4CH-926 is a pleated polyester cartridge filter element engineered for residential spa and small above-ground pool applications, providing 25.0 sq ft of filtration area through a Reemay nonwoven polyester media pack with SAE-thread bottom configuration. Dimensional specifications: 4.6875-inch OD, 1.5-inch SAE threaded bottom hub, 8.25-inch overall length, with an open-flow top end cap. End caps are ABS injection-molded with a closed, integrated SAE-threaded fitting at the base for direct standpipe mounting in compatible housings. Nominal filtration efficiency is 15 microns under standard test conditions. The element is rated for continuous service to 104°F and operating pressures to 25 PSI, with intermittent spa-temperature excursions to 115°F acceptable per Unicel test protocol.\u003c\/p\u003e\n\u003cp\u003eService interval recommendation: rinse with fresh water every 2–4 weeks for spa applications and every 4–6 weeks for above-ground pool service; chemical soak (dilute TSP or enzyme cleaner) every 4–6 weeks to remove oils, surfactants, and biofilm that resist water rinsing alone. Replacement is triggered at ΔP ≥ 8 PSI above clean-filter operating baseline, at visible media degradation (fabric tears, pleat channeling, delaminated end cap bond), or on an annual cycle, whichever occurs first. Chemical compatibility: polyester media and ABS end cap construction tolerate continuous operation at ≤ 10 ppm free available chlorine or ≤ 30 ppm total bromine; muriatic acid soak at 1:20 dilution is compatible for calcium scale removal (20-minute maximum exposure, rinse thoroughly before reinstallation). Enzyme cleaner compatible without restriction. Standard Unicel 90-day manufacturer's defect warranty applies through authorized distribution.\u003c\/p\u003e\n\u003ch3\u003eWhat's Included\u003c\/h3\u003e\n\u003cp\u003eYour order includes the selected quantity of replacement pool filter cartridges. Each unit is individually inspected for quality before shipping.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Unicel","offers":[{"title":"Default Title","offer_id":42315917295662,"sku":"UNF4CH926","price":31.77,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0016\/3453\/3422\/files\/UNF4CH926_52c56be4-9f56-4081-82c7-ec0b9d0ac737.jpg?v=1777663706"},{"product_id":"unicel-4ch-935","title":"Unicel 4CH-935 Replacement Filter for Waterway 500-0035L | 35 Sq. Ft.","description":"\u003cdiv class=\"pz-pdp\"\u003e\n\u003ch3\u003eOverview\u003c\/h3\u003e\n\u003cp\u003eThe Unicel 4CH-935 is a pleated polyester spa cartridge filter element providing 35.0 sq ft of effective filtration area through a Reemay nonwoven polyester media pack with nominal 15-micron filtration efficiency. Dimensional specifications: 4.875-inch OD, 2.0-inch ID with 1.5-inch threaded SAE bottom hub, 9.25-inch overall length; end cap configuration features an ABS-molded threaded bottom (1.5-inch MPT integrated handle) and a closed top cap. The element is supplied in coreless construction, with pleat geometry providing axial stability across the spa pressure operating range (5–15 PSI typical). Continuous service temperature is rated to 104°F with intermittent excursions to 120°F per manufacturer testing. The threaded-handle bottom interface eliminates separate retention hardware and enables single-cartridge tool-free service in skim-filter housing configurations.\u003c\/p\u003e\n\u003cp\u003eService interval recommendation: spa applications — rinse with fresh water every 2–4 weeks; chemical soak (TSP solution or dedicated enzyme cartridge cleaner) every 4–6 weeks to remove body oils, lotions, and surfactant residue that resist rinse-only cleaning. Replacement is recommended at 12-month maximum service life, or at ΔP ≥ 5 PSI above clean operating baseline, whichever occurs first. Chemical compatibility: polyester media and ABS end caps tolerate continuous service at ≤ 10 ppm free available chlorine or ≤ 30 ppm total bromine; muriatic acid soak at 1:20 dilution compatible for calcium scale removal (20-minute maximum exposure, thorough rinse before reinstallation). Avoid ozone-primary sanitization exposure without verifying media compatibility. Standard Unicel 90-day manufacturer's defect warranty applies through authorized distribution.\u003c\/p\u003e\n\u003ch3\u003eWhat's Included\u003c\/h3\u003e\n\u003cp\u003eYour order includes the selected quantity of replacement pool filter cartridges. Each unit is individually inspected for quality before shipping.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Unicel","offers":[{"title":"Default Title","offer_id":42315917361198,"sku":"UNF4CH935","price":40.46,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0016\/3453\/3422\/files\/UNF4CH935_dc9aa456-36d1-4c81-b2b7-d855717c2e42.jpg?v=1777663712"}],"url":"https:\/\/poolzilla.com\/collections\/spa-cartridges.oembed?page=5","provider":"Poolzilla","version":"1.0","type":"link"}