{"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","url":"https:\/\/poolzilla.com\/products\/unicel-4ch-24","provider":"Poolzilla","version":"1.0","type":"link"}