{"product_id":"unicelreplacementfiltercartridge50sf4ch50unf4ch50","title":"Unicel Replacement Filter Cartridge 50 sf | 4CH-50","description":"\u003cdiv class=\"product-description\"\u003e\n  \u003ch2\u003eUnicel 4CH-50 Replacement Spa Filter Cartridge – 50 Sq Ft (4\" OD x 14\" Length, 1-1\/2\" MPT Threaded Bottom)\u003c\/h2\u003e\n\n  \u003cp\u003e\n    The Unicel 4CH-50 is a high-capacity \u003cstrong\u003e50 sq ft\u003c\/strong\u003e pleated spa filter cartridge designed for select hot tubs and spa filter\n    canisters that use a \u003cstrong\u003ethreaded screw-in bottom connection\u003c\/strong\u003e. With its compact 4\" diameter body and taller pleat pack, it\n    provides strong debris capture and longer run time between cleanings compared to smaller cartridges.\n  \u003c\/p\u003e\n\n  \u003ch3\u003eKey Features\u003c\/h3\u003e\n  \u003cul\u003e\n    \u003cli\u003e\n\u003cstrong\u003e50 sq ft\u003c\/strong\u003e filtration area for clearer water and steady circulation\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eBottom:\u003c\/strong\u003e 1-1\/2\" male pipe thread (MPT) screw-in connection\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eTop:\u003c\/strong\u003e open end for compatible standpipe\/canister designs\u003c\/li\u003e\n    \u003cli\u003eDurable pleated media and rigid core built for repeated cleaning cycles\u003c\/li\u003e\n    \u003cli\u003eIdeal replacement when pleats are torn, flattened, or the cartridge stays restrictive after cleaning\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-50\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eFiltration Area:\u003c\/strong\u003e 50 sq ft\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eOutside Diameter:\u003c\/strong\u003e 4\"\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eLength:\u003c\/strong\u003e 14\"\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eTop End Cap:\u003c\/strong\u003e Open\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eTop Inside Diameter:\u003c\/strong\u003e 2\" (open)\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eBottom End Cap:\u003c\/strong\u003e 1-1\/2\" MPT thread\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003ePleat Count:\u003c\/strong\u003e 220\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 PWW50P3\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eFilbur:\u003c\/strong\u003e FC-0172\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eDarlly:\u003c\/strong\u003e 40505\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eBaleen:\u003c\/strong\u003e AK-4003\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eOther common references:\u003c\/strong\u003e 40025, 210-0100, 8CH-950 (verify by dimensions and thread style)\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003ch3\u003eCompatibility Notes\u003c\/h3\u003e\n  \u003cul\u003e\n    \u003cli\u003eThis cartridge uses a \u003cstrong\u003ethreaded bottom\u003c\/strong\u003e (1-1\/2\" MPT). If your current filter has a different thread size (or a slip\/non-threaded bottom), you need a different cartridge.\u003c\/li\u003e\n    \u003cli\u003eAlways confirm fit by matching the \u003cstrong\u003e4\" OD\u003c\/strong\u003e, \u003cstrong\u003e14\" length\u003c\/strong\u003e, and \u003cstrong\u003e1-1\/2\" threaded bottom\u003c\/strong\u003e.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003ch3\u003eWhen to Replace\u003c\/h3\u003e\n  \u003cul\u003e\n    \u003cli\u003eFlow is weak or the spa struggles to maintain circulation even after cleaning\u003c\/li\u003e\n    \u003cli\u003ePleats are torn, frayed, flattened, or separating from the end caps\u003c\/li\u003e\n    \u003cli\u003eThe cartridge quickly plugs up again after rinsing\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=Unicel%204CH-50\"\u003eUnicel 4CH-50 (Shop \/ Options)\u003c\/a\u003e\u003c\/li\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 regularly (often weekly with heavy 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 performance.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\u003c\/div\u003e\n","brand":"Unicel","offers":[{"title":"Default Title","offer_id":52589962395964,"sku":"4CH-50","price":43.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0736\/3280\/9276\/files\/unicel-replacement-filter-cartridge-50-sf-4ch-50-cartridges-2857586.jpg?v=1770393389","url":"https:\/\/aquapoolsupply.com\/products\/unicelreplacementfiltercartridge50sf4ch50unf4ch50","provider":"Aqua Pool Supply","version":"1.0","type":"link"}