{"product_id":"unicel-c-4313","title":"Unicel C-4313 Replacement Filter for Intex Type S1 | 2.5 Sq. Ft.","description":"\u003cdiv class=\"pz-pdp\"\u003e\n\u003ch3\u003eOverview\u003c\/h3\u003e\n\u003cp\u003eThe Unicel C-4313 is a pleated polyester cartridge filter element engineered for above-ground spa and small-volume residential pool circulation systems, providing 2.5 sq ft of filtration area on a compact form factor compatible with Intex Type S1 \/ Size D filter housings. Construction is coreless, utilizing Reemay-grade nonwoven polyester media with nominal 20-micron filtration efficiency, terminating in injection-molded ABS end caps with closed-bottom and open-top geometry consistent with the Type S1 standpipe interface. The element is rated for low-flow circulation pump applications typical of inflatable and frame-style above-ground installations, with continuous service temperatures to 104°F. UV-stabilized end cap bonding resists degradation under standard sanitizer exposure, and the coreless pleat-pack geometry maintains structural integrity within the pressure envelope of OEM-supplied cartridge pumps.\u003c\/p\u003e\n\u003cp\u003eService interval recommendation: rinse with fresh water every 1–2 weeks of active circulation, with chemical soak (dilute TSP or enzyme cleaner) at 4-week intervals to address surfactant and lotion loading typical in above-ground installations. Replacement is recommended at 4–6 week intervals under continuous seasonal use, or at ΔP ≥ 5 PSI above clean operating baseline, whichever occurs first. Polyester media is compatible with continuous operation at ≤ 10 ppm free available chlorine and ≤ 30 ppm total bromine; muriatic acid soak (1:20 dilution, 20 minutes maximum) is compatible for calcium scale remediation. Enzyme cleaners 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 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":42315911233582,"sku":"UNFC4313","price":13.39,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0016\/3453\/3422\/files\/UNFC4313_76d65c22-4ae8-4f6a-b487-1d1842b45451.jpg?v=1777663121","url":"https:\/\/poolzilla.com\/products\/unicel-c-4313","provider":"Poolzilla","version":"1.0","type":"link"}