{"product_id":"unicel-5ch-35","title":"Unicel 5CH-35 Replacement Filter for Maax PMAX50P4 | 35 Sq. Ft.","description":"\u003cdiv class=\"pz-pdp\"\u003e\n\u003ch3\u003eOverview\u003c\/h3\u003e\n\u003cp\u003eThe Unicel 5CH-35 is a pleated polyester cartridge filter element engineered for high-capacity spa and portable pool applications, delivering 35.0 sq ft of effective filtration area through a high-density Reemay nonwoven polyester media pack. Dimensional specifications conform to the 5CH-family form factor: 4-15\/16-inch OD, 2-1\/8-inch ID with molded SAE thread, and 7-inch overall length, configured with one open end (threaded) and one closed end. End caps are ABS injection-molded for chemical resistance and dimensional stability under sustained spa operating temperatures up to 104°F. Nominal filtration efficiency falls within the 20-micron range under standard test conditions, providing the surface area and dirt-holding capacity required for high-bather-load spa environments and small-volume above-ground pool circulation loops.\u003c\/p\u003e\n\u003cp\u003eService interval recommendation: rinse with fresh water every 2–4 weeks under typical spa duty cycles; chemical soak (dilute TSP or commercial enzyme cleaner) every 4–6 weeks to remove accumulated body oils, surfactants, and cosmetic residues that resist rinse-only cleaning. Replace the element at ΔP ≥ 5 PSI above clean-filter operating baseline, or at 12–15 months of service, whichever occurs first; reduce replacement cycle to 6–9 months for spas operating under continuous high-bather load. Chemical compatibility: continuous service at ≤ 10 ppm free available chlorine or ≤ 30 ppm total bromine; muriatic acid soak at 1:20 dilution compatible for calcium scale remediation (20-minute maximum exposure, followed by thorough fresh-water rinse). ABS end cap construction is fully compatible with standard acid wash protocols. Standard Unicel 90-day manufacturer's defect warranty applies through authorized distribution channels.\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":42315917623342,"sku":"UNF5CH35","price":41.76,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0016\/3453\/3422\/files\/UNF5CH35_63c18afe-2ebc-41fb-8e6b-7b27b91cce47.jpg?v=1777663736","url":"https:\/\/poolzilla.com\/products\/unicel-5ch-35","provider":"Poolzilla","version":"1.0","type":"link"}