{"product_id":"unicel-4ch-949","title":"Unicel 4CH-949 Replacement Filter for Waterway 500-0049L | 50 Sq. Ft.","description":"\u003cdiv class=\"pz-pdp\"\u003e\n\u003ch3\u003eOverview\u003c\/h3\u003e\n\u003cp\u003eThe Unicel 4CH-949 is a pleated polyester spa cartridge filter element rated at 50 sq ft of effective filtration area, constructed for the low-flow, elevated-temperature service profile typical of residential spa and portable hot tub circulation systems. Dimensional specifications: 4.9375-inch OD, 2.125-inch ID, 8.3125-inch length, with closed-bottom and open-top ABS injection-molded end caps configured for handle-grip installation. Media specification: Reemay-class nonwoven polyester, nominal 15-micron filtration efficiency, supported by an integral PVC pipe core providing axial rigidity through the spa pump operating range of 5–15 PSI. Maximum continuous service temperature is rated at 115°F with intermittent excursions to 120°F per manufacturer protocol. End cap adhesive is UV-stabilized and chemically compatible with standard spa water chemistry.\u003c\/p\u003e\n\u003cp\u003eService interval recommendations for spa-duty cartridge elements: rinse with fresh water every 2–4 weeks; chemical soak in dilute TSP or enzyme cleaner every 4–6 weeks to remove body oils, lotions, and surfactant residues that resist water rinsing alone. ΔP replacement trigger: ≥ 5 PSI above clean-filter operating baseline; calendar-based replacement at ≤ 12-month intervals for typical residential spa use, accelerated to ≤ 6-month intervals under heavy bather load. Chemical compatibility: polyester media and ABS end caps tolerate continuous operation at ≤ 10 ppm free available chlorine or ≤ 30 ppm total bromine; muriatic acid wash at 1:20 dilution is compatible for calcium scale removal (20-minute maximum exposure, thorough rinse before reinstallation). Enzyme cleaners compatible without restriction. Standard Unicel 90-day manufacturer 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":42315917459502,"sku":"UNF4CH949","price":45.71,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0016\/3453\/3422\/files\/UNF4CH949_5ae4214e-0cf1-475d-a929-f70c1578909e.jpg?v=1777663724","url":"https:\/\/poolzilla.com\/products\/unicel-4ch-949","provider":"Poolzilla","version":"1.0","type":"link"}