{"product_id":"water-doctor-ros4a-quick-twist-replacement-cartridges","title":"Water Doctor ROS4A Replacement Filter Cartridges – PP \/ CTO \/ T33 \/ RO","description":"\u003ch2\u003eQuick-twist replacement cartridges for the Water Doctor ROS4A system\u003c\/h2\u003e\u003cp\u003eThese \u003cstrong\u003eWater Doctor ROS4A Replacement Filter Cartridges\u003c\/strong\u003e are designed for the Water Doctor ROS4A 4-stage reverse osmosis system. Choose PP, CTO, T33 or RO250 depending on the filter stage that needs replacement.\u003c\/p\u003e\u003ch3\u003eCompatible system\u003c\/h3\u003e\u003cul\u003e\u003cli\u003eWater Doctor ROS4A 4-Stage Undersink RO System\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eAvailable cartridges\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePP Quick Twist\u003c\/strong\u003e for sediment pre-filtration\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCTO Quick Twist\u003c\/strong\u003e for carbon block filtration\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eT33 Quick Twist\u003c\/strong\u003e for final taste polishing\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRO250 Quick Twist\u003c\/strong\u003e for the reverse osmosis stage\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eBest for\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eCustomers maintaining an existing ROS4A system\u003c\/li\u003e\n\u003cli\u003eReplacing one filter stage at a time\u003c\/li\u003e\n\u003cli\u003eKeeping the RO system on a routine maintenance schedule\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eMaintenance note\u003c\/h3\u003e\u003cp\u003eReplacement timing depends on water conditions and household usage. For proper fit, confirm your system model is ROS4A before ordering.\u003c\/p\u003e\u003ch3\u003eBefore ordering\u003c\/h3\u003e\u003cp\u003eThese are quick-twist ROS4A cartridges. They are not the same as standard 2.5 x 10 cartridges or ROS4B replacement filters.\u003c\/p\u003e","brand":"Water Doctor","offers":[{"title":"PP Quick Twist","offer_id":51898701513009,"sku":"PP-ROF4A","price":49.99,"currency_code":"CAD","in_stock":true},{"title":"CTO Quick Twist","offer_id":51898701545777,"sku":"CTO-ROF4A","price":49.99,"currency_code":"CAD","in_stock":true},{"title":"T33 Quick Twist","offer_id":51898701578545,"sku":"T33-ROF4A","price":49.99,"currency_code":"CAD","in_stock":true},{"title":"RO250 Quick Twist","offer_id":51898701611313,"sku":"RO-ROF4A","price":149.99,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0919\/0850\/5905\/files\/RO250-ROF4A.jpg?v=1754681817","url":"https:\/\/shop.waterdoctor.ca\/products\/water-doctor-ros4a-quick-twist-replacement-cartridges","provider":"Water Doctor Canada Inc.","version":"1.0","type":"link"}