{"product_id":"unicelreplacementfiltercartridge20sf4ch925unf4ch925","title":"Unicel Replacement Filter Cartridge 20 Sf | 4CH-925","description":"\u003cdiv class=\"product-description\"\u003e\n  \u003ch2\u003eUnicel 4CH-925 Replacement Spa Filter Cartridge – 20 Sq Ft (4-5\/8\" OD x 7-1\/4\" Length, 1-1\/2\" SAE Thread)\u003c\/h2\u003e\n\n  \u003cp\u003e\n    The Unicel 4CH-925 is a \u003cstrong\u003etop-load spa filter cartridge\u003c\/strong\u003e designed for select hot tubs and spa filter canisters that use a\n    \u003cstrong\u003e1-1\/2\" SAE threaded (screw-in)\u003c\/strong\u003e bottom connection. It uses durable pleated media to capture fine debris for clearer water and\n    more consistent flow when rinsed and cleaned on a regular schedule.\n  \u003c\/p\u003e\n\n  \u003ch3\u003eKey Features\u003c\/h3\u003e\n  \u003cul\u003e\n    \u003cli\u003e\n\u003cstrong\u003e20 sq ft\u003c\/strong\u003e filtration area for effective spa water polishing\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eBottom:\u003c\/strong\u003e 1-1\/2\" SAE screw-in thread for a secure fit in compatible housings\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eTop:\u003c\/strong\u003e handle-style end cap for easy removal\u003c\/li\u003e\n    \u003cli\u003eReplaces worn or damaged cartridges to help restore circulation and water clarity\u003c\/li\u003e\n    \u003cli\u003eBuilt for repeated rinse and deep-clean cycles\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003ch3\u003eSpecifications\u003c\/h3\u003e\n  \u003cul\u003e\n    \u003cli\u003e\n\u003cstrong\u003ePart Number:\u003c\/strong\u003e 4CH-925\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eFiltration Area:\u003c\/strong\u003e 20 sq ft\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eOutside Diameter:\u003c\/strong\u003e 4-5\/8\" (4.625\")\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eLength:\u003c\/strong\u003e 7-1\/4\" (7.25\")\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eTop End Cap:\u003c\/strong\u003e Handle (closed)\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eBottom End Cap:\u003c\/strong\u003e 1-1\/2\" SAE thread (injection molded)\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003ePleat Count:\u003c\/strong\u003e 190\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eMedia:\u003c\/strong\u003e 3 oz pleated media\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003ch3\u003eReplaces \/ Cross References\u003c\/h3\u003e\n  \u003cul\u003e\n    \u003cli\u003e\n\u003cstrong\u003ePleatco:\u003c\/strong\u003e PSANT20P3\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eFilbur:\u003c\/strong\u003e FC-0126\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eDarlly:\u003c\/strong\u003e 42524\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eBaleen:\u003c\/strong\u003e AK-90083\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003ch3\u003eCompatibility Notes\u003c\/h3\u003e\n  \u003cul\u003e\n    \u003cli\u003eDesigned for spa filter canisters that require a \u003cstrong\u003e1-1\/2\" SAE screw-in\u003c\/strong\u003e cartridge with a \u003cstrong\u003e4-5\/8\" diameter\u003c\/strong\u003e body.\u003c\/li\u003e\n    \u003cli\u003eOften used in select spa brands such as \u003cstrong\u003eStrong\u003c\/strong\u003e, \u003cstrong\u003eSoftsider\u003c\/strong\u003e, and \u003cstrong\u003eFutura\u003c\/strong\u003e (verify by measurements and thread style).\u003c\/li\u003e\n    \u003cli\u003eAlways confirm fit by matching the \u003cstrong\u003eOD\u003c\/strong\u003e, \u003cstrong\u003elength\u003c\/strong\u003e, and \u003cstrong\u003ebottom thread type\u003c\/strong\u003e to your existing cartridge.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003ch3\u003eWhen to Replace\u003c\/h3\u003e\n  \u003cul\u003e\n    \u003cli\u003ePleats are torn, frayed, flattened, or separating from the end caps\u003c\/li\u003e\n    \u003cli\u003eFlow is weak or the system struggles to maintain circulation even after cleaning\u003c\/li\u003e\n    \u003cli\u003eWater stays cloudy despite balanced chemistry and normal sanitizer levels\u003c\/li\u003e\n    \u003cli\u003eEnd caps or the threaded connection are cracked\/warped and won’t seal properly\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003ch3\u003eRelated Products\u003c\/h3\u003e\n  \u003cul\u003e\n    \u003cli\u003e\u003ca href=\"https:\/\/aquapoolsupply.com\/search?q=spa%20cartridge%20filter%20cleaner\"\u003eSpa Cartridge Filter Cleaner\u003c\/a\u003e\u003c\/li\u003e\n    \u003cli\u003e\u003ca href=\"https:\/\/aquapoolsupply.com\/search?q=cartridge%20cleaning%20wand\"\u003eCartridge Cleaning Wand\u003c\/a\u003e\u003c\/li\u003e\n    \u003cli\u003e\u003ca href=\"https:\/\/aquapoolsupply.com\/search?q=spa%20water%20test%20strips\"\u003eSpa Water Test Strips\u003c\/a\u003e\u003c\/li\u003e\n    \u003cli\u003e\u003ca href=\"https:\/\/aquapoolsupply.com\/search?q=spa%20pre-filter%20hose\"\u003eSpa Fill \/ Hose Pre-Filters\u003c\/a\u003e\u003c\/li\u003e\n    \u003cli\u003e\u003ca href=\"https:\/\/aquapoolsupply.com\/search?q=silicone%20pool%20lube\"\u003eSilicone O-Ring Lubricant (Pool\/Spa)\u003c\/a\u003e\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003ch3\u003eMaintenance Tips\u003c\/h3\u003e\n  \u003cul\u003e\n    \u003cli\u003eRinse the cartridge frequently (often weekly with regular spa use) to prevent restriction and keep flow strong.\u003c\/li\u003e\n    \u003cli\u003eDeep clean every 3–6 weeks with a cartridge cleaner to remove oils; rinse thoroughly before reinstalling.\u003c\/li\u003e\n    \u003cli\u003eIf scale is present, degrease first, then treat for scale (never reverse the order), and rinse completely.\u003c\/li\u003e\n    \u003cli\u003eRotating between two cartridges (one in use, one drying after cleaning) can extend overall filter life and improve filtration.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\u003c\/div\u003e\n","brand":"Unicel","offers":[{"title":"Default Title","offer_id":52589962428732,"sku":"4CH-925","price":32.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0736\/3280\/9276\/files\/unicel-replacement-filter-cartridge-20-sf-4ch-925-cartridges-1676187.jpg?v=1770393388","url":"https:\/\/aquapoolsupply.com\/products\/unicelreplacementfiltercartridge20sf4ch925unf4ch925","provider":"Aqua Pool Supply","version":"1.0","type":"link"}