{"product_id":"unicel-c-4325","title":"Unicel C-4325 Replacement Filter for Hayward CX225RE | 25 Sq. Ft.","description":"\u003cdiv class=\"pz-pdp\"\u003e\n\u003ch3\u003eOverview\u003c\/h3\u003e\n\u003cp\u003eThe Unicel C-4325 is a pleated polyester cartridge filter element rated at 25.0 sq ft of effective filtration area, constructed for direct OEM replacement service in Hayward Star-Clear cartridge filter housings. Media specification: Reemay nonwoven polyester at 15-micron nominal filtration efficiency, supported on a Schedule-40 PVC pipe core with ABS injection-molded end caps in a closed-bottom, open-top configuration. Dimensional specifications: 4.9375-inch OD, 2.125-inch ID, 9.75-inch overall length. End cap tolerance held within ±0.030 inch on OD for bypass-free seating against housing top and bottom seats. Operating range: 8–25 PSI continuous service at temperatures up to 104°F, consistent with residential pool circulation system parameters and Hayward Star-Clear pump head curve matching at standard turnover rates.\u003c\/p\u003e\n\u003cp\u003eService interval recommendation: rinse every 4–6 weeks under standard residential bather load, or at ΔP ≥ 8 PSI above clean-filter operating baseline. Chemical soak (TSP or enzyme cleaner) every 3–6 months; replace annually or at first indication of fabric channeling, pleat collapse, or end cap separation. Acid wash with muriatic at 1:20 dilution is compatible for calcium scale removal (20-minute maximum exposure, thorough fresh-water rinse before reinstallation); ABS end cap construction tolerates standard acid wash procedure without adhesive degradation. Chlorine tolerance: continuous service at ≤ 10 ppm free available chlorine; bromine compatible without restriction. Post-installation, verify housing pressure differential against clean baseline and inspect for bypass indicators within the first 24 service hours. Standard Unicel 90-day manufacturer defect warranty applies through authorized trade distribution.\u003c\/p\u003e\n\u003ch3\u003eWhat's Included\u003c\/h3\u003e\n\u003cp\u003eYour order includes the selected quantity of replacement pool 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":42315911397422,"sku":"UNFC4325","price":28.06,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0016\/3453\/3422\/files\/UNFC4325_d6ce9da7-9c3a-4e15-947c-4b35f761386a.jpg?v=1777663139","url":"https:\/\/poolzilla.com\/products\/unicel-c-4325","provider":"Poolzilla","version":"1.0","type":"link"}