{"product_id":"unicel-6ch-25","title":"Unicel 6CH-25 Replacement Filter for Advanced PTL20W-SV-P4 (1-1 | 25 Sq. Ft.","description":"\u003cdiv class=\"pz-pdp\"\u003e\n\u003ch3\u003eOverview\u003c\/h3\u003e\n\u003cp\u003eThe Unicel 6CH-25 is a pleated polyester spa cartridge filter element delivering 25.0 sq ft of effective filtration area through a high-density Reemay nonwoven polyester media pack with integrated 1-1\/2-inch MPT (male pipe thread) standpipe fitting molded into the bottom end cap. Construction features ABS injection-molded end caps with a closed top and threaded-bottom configuration suited to single-cartridge, top-load spa filter housings utilizing a threaded standpipe seating interface. Nominal filtration rating: 20 microns under standard test conditions. The element is rated for continuous service at temperatures to 115°F with intermittent excursions to 120°F acceptable, and operating pressures up to 15 PSI typical for residential spa circulation systems. End cap bonding chemistry is formulated for sustained chemical exposure under standard spa water sanitization regimes.\u003c\/p\u003e\n\u003cp\u003eSpa cartridge service intervals run accelerated relative to pool elements due to bather-load oil and surfactant accumulation: rinse with fresh water at 2–4 week intervals; chemical soak (dilute TSP or enzyme cleaner) at 4–6 week intervals to dissolve oils that resist mechanical rinsing. Replace at ≤ 6-month intervals for typical residential spa use, or on a ΔP trigger of ≥ 5 PSI above clean-filter 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 (1:20 dilution, 20-minute maximum exposure) compatible for calcium scale removal — rinse thoroughly before reinstallation. Enzyme cleaners compatible without restriction. Inspect threaded fitting for cross-threading or media-pack delamination at each service cycle; replace immediately if compromised. 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":42315918049326,"sku":"UNF6CH25","price":35.12,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0016\/3453\/3422\/files\/UNF6CH25_dfdf7b72-453a-4550-a0ea-7099371ddca8.jpg?v=1777663771","url":"https:\/\/poolzilla.com\/products\/unicel-6ch-25","provider":"Poolzilla","version":"1.0","type":"link"}