{"product_id":"unicel-c-7479","title":"Unicel C-7479 Replacement Filter for Caldera Spas 72830 | 75 Sq. Ft.","description":"\u003cdiv class=\"pz-pdp\"\u003e\n\u003ch3\u003eOverview\u003c\/h3\u003e\n\u003cp\u003eThe Unicel C-7479 is a pleated polyester spa cartridge filter element delivering 75.0 sq ft of filtration area in a high-capacity form factor engineered for Caldera Spas circulation systems and equivalent housings. Media construction is Reemay-grade nonwoven polyester with a nominal 15-micron filtration efficiency, supported by molded ABS end caps and a structural inner core sized for spa-rated operating pressures. The cartridge features a threaded bottom adapter typical of the Caldera 72830 housing series, with the upper end cap configured as a handled closed top for tool-free service extraction. The element is rated for continuous service at temperatures up to 115°F, consistent with portable spa duty cycles, and is dimensionally controlled to ±0.030 inch on critical mating surfaces to ensure bypass-free seating in OEM housings.\u003c\/p\u003e\n\u003cp\u003eService intervals for spa cartridge applications run accelerated relative to pool elements: rinse with fresh water every 2–4 weeks, perform a chemical soak (dilute TSP or enzyme-based cartridge cleaner) every 4–6 weeks to dissolve oils, lotions, and surfactant residue not removed by rinsing, and replace the element at 12–15 months of service or at a ΔP ≥ 5 PSI above clean operating baseline, whichever occurs first. Chemical compatibility: polyester fabric is rated for 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 remediation, with a maximum 20-minute exposure followed by thorough fresh-water rinse prior to 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":42315913101358,"sku":"UNFC7479","price":59.76,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0016\/3453\/3422\/files\/UNFC7479_85b035d4-ab54-4238-8a30-c20e4bb1313d.jpg?v=1777663327","url":"https:\/\/poolzilla.com\/products\/unicel-c-7479","provider":"Poolzilla","version":"1.0","type":"link"}