{"product_id":"unicel-c-7442","title":"Unicel C-7442 Replacement Filter for Hayward CX410RE | 40 Sq. Ft.","description":"\u003cdiv class=\"pz-pdp\"\u003e\n\u003ch3\u003eOverview\u003c\/h3\u003e\n\u003cp\u003eThe Unicel C-7442 is a pleated polyester cartridge filter element providing 40.0 sq ft of effective filtration area, engineered for residential and light commercial pool filtration housings in the Hayward Star-Clear Plus family. Construction consists of a Reemay-grade spunbond polyester nonwoven media pack with a nominal filtration efficiency in the 20-micron range, supported on a Schedule-40 PVC center core for axial rigidity under operating load. End caps are ABS injection-molded — closed bottom, open-flow top — bonded with UV-stabilized adhesive resistant to standard pool chemistry degradation. The element is rated for continuous service to 104°F and operating pressures to 25 PSI, with clean operating differential typical in the 8–10 PSI range when matched to correctly sized circulation pumps.\u003c\/p\u003e\n\u003cp\u003eService interval recommendation for residential installations: pressure-differential-based replacement triggered at ΔP ≥ 8 PSI above clean-filter operating baseline, or on an annual calendar cycle, whichever occurs first. Intermediate maintenance protocol: rinse every 4–6 weeks; chemical soak with TSP solution or commercial enzyme cleaner every 3–6 months to remove accumulated oils and surfactants that resist standard rinsing. Chemical compatibility: continuous service at ≤ 10 ppm free available chlorine or equivalent bromine concentration; muriatic acid soak at 1:20 dilution (20 minutes maximum exposure) compatible for calcium scale removal — rinse thoroughly before reinstallation. Inspect housing O-ring at every cartridge change and verify clean-filter pressure reading post-installation to establish new ΔP baseline. Standard Unicel 90-day manufacturer's 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":42315912904750,"sku":"UNFC7442","price":48.83,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0016\/3453\/3422\/files\/UNFC7442_c56f881b-8353-46db-ac63-465127b9420b.jpg?v=1777663293","url":"https:\/\/poolzilla.com\/products\/unicel-c-7442","provider":"Poolzilla","version":"1.0","type":"link"}