{"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","url":"https:\/\/poolzilla.com\/products\/unicel-4ch-20","provider":"Poolzilla","version":"1.0","type":"link"}