{"product_id":"unicel-c-5423","title":"Unicel C-5423 Replacement Filter for Marquis Spas 03FIL0350 | 34 Sq. Ft.","description":"\u003cdiv class=\"pz-pdp\"\u003e\n\u003ch3\u003eOverview\u003c\/h3\u003e\n\u003cp\u003eThe Unicel C-5423 is a pleated polyester spa filter cartridge providing 34.0 sq ft of effective filtration area, engineered as a direct replacement for the Marquis Spas 03FIL0350 element. Media construction is Reemay nonwoven polyester at a 20-micron nominal filtration rating, configured in a high-pleat-count geometry to maximize surface area within the standard Marquis canister envelope. End caps are ABS injection-molded with a closed bottom and an open-top configuration terminating in a 2-1\/8-inch SAE-thread handle adapter for tool-free extraction. The element is rated for continuous service at temperatures to 115°F with intermittent excursions to 120°F, supporting standard spa circulation pump operating pressures in the 5–15 PSI range.\u003c\/p\u003e\n\u003cp\u003eService interval recommendation for spa applications: fresh-water rinse every 2–4 weeks; chemical soak with dilute TSP or commercial enzyme cleaner every 4–6 weeks to remove accumulated body oils, lotions, and surfactants that resist rinse-only cleaning. Replace at 12-month intervals under typical residential spa duty cycles, or sooner when ΔP rises ≥ 5 PSI above clean-filter operating baseline. Chemical compatibility: polyester media and ABS end caps tolerate continuous operation at ≤ 10 ppm free available chlorine or ≤ 30 ppm total bromine; muriatic acid soak at 1:20 dilution is compatible for calcium scale remediation, with 20-minute maximum exposure followed by thorough fresh-water rinse. 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 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":42315912347694,"sku":"UNFC5423","price":37.46,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0016\/3453\/3422\/files\/UNFC5423_bcd1b532-cb74-4ac9-ad85-827763c0cd71.jpg?v=1777663239","url":"https:\/\/poolzilla.com\/products\/unicel-c-5423","provider":"Poolzilla","version":"1.0","type":"link"}