{"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","url":"https:\/\/poolzilla.com\/products\/unicel-4ch-50","provider":"Poolzilla","version":"1.0","type":"link"}