{"product_id":"water-doctor-4-5-x-20-big-blue-replacement-filter-cartridges","title":"Water Doctor 4.5 x 20 Replacement Filter Cartridges – PP \/ PS \/ PL \/ CTO \/ GAC","description":"\u003ch2\u003eBig Blue 4.5 x 20 replacement filter cartridges\u003c\/h2\u003e\u003cp\u003eThese \u003cstrong\u003eWater Doctor 4.5 x 20 Replacement Filter Cartridges\u003c\/strong\u003e are large-format cartridges for compatible Big Blue housings and whole-home filtration setups. Choose PP, PL, PS, CTO or GAC depending on your filtration need and existing housing.\u003c\/p\u003e\u003ch3\u003eBest for\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eWhole-home pre-filter housings using 4.5 x 20 cartridges\u003c\/li\u003e\n\u003cli\u003eCustomers replacing sediment or carbon cartridges\u003c\/li\u003e\n\u003cli\u003eHomes with higher flow needs than slimline housings\u003c\/li\u003e\n\u003cli\u003ePre-filtration before softeners, conditioners or UV systems\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eAvailable cartridges\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePP\u003c\/strong\u003e melt-blown sediment cartridge\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePL\u003c\/strong\u003e pleated sediment cartridge\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePS\u003c\/strong\u003e spun sediment cartridge\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCTO\u003c\/strong\u003e carbon block cartridge\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGAC\u003c\/strong\u003e granular activated carbon cartridge\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eBefore ordering\u003c\/h3\u003e\u003cp\u003ePlease confirm your housing size is 4.5 x 20 before purchasing. These cartridges are not the same as 4.5 x 10, 2.5 x 10 or 2.5 x 20 cartridges.\u003c\/p\u003e\u003ch3\u003eMaintenance note\u003c\/h3\u003e\u003cp\u003eReplacement frequency depends on sediment load, water usage, pressure drop and cartridge type.\u003c\/p\u003e","brand":"Water Doctor","offers":[{"title":"PP 4.5 x 20","offer_id":51898771800369,"sku":"PP-20B05M-1","price":29.99,"currency_code":"CAD","in_stock":true},{"title":"PL 4.5 x 20","offer_id":51898771833137,"sku":"PL-20B05M","price":28.99,"currency_code":"CAD","in_stock":true},{"title":"PS 4.5 x 20","offer_id":51898771865905,"sku":"PS-20B05M","price":29.99,"currency_code":"CAD","in_stock":true},{"title":"CTO 4.5 x 20","offer_id":51898771898673,"sku":"CTO-20B05M","price":74.99,"currency_code":"CAD","in_stock":true},{"title":"GAC 4.5 x 20","offer_id":51898771931441,"sku":"GAC-20B05M","price":79.99,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0919\/0850\/5905\/files\/PP-20B05M.jpg?v=1754685943","url":"https:\/\/shop.waterdoctor.ca\/products\/water-doctor-4-5-x-20-big-blue-replacement-filter-cartridges","provider":"Water Doctor Canada Inc.","version":"1.0","type":"link"}