{"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","url":"https:\/\/poolzilla.com\/products\/unicel-4ch-30","provider":"Poolzilla","version":"1.0","type":"link"}