{"product_id":"cartridge-filter-set-130sqft-520","title":"Unicel Cartridge Filter Set 130 Sq Ft 520","description":"\u003cp\u003eThe Unicel C-7472-4 is the four cartridge replacement set for the Clean \u0026amp; Clear Plus 520. Each element runs 7 in. across the outside diameter and 32-1\/16 in. long, with an open top and an open bottom of 3 in. inside diameter.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat it fits\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eUnicel lists this set for the Clean \u0026amp; Clear Plus 520 made after 11\/98, under Pac-Fab and Pentair as well as Waterway Plastics. Check the dimensions against the elements you pull out before ordering, since several large cartridge tanks look alike from the outside and only the cartridge length tells them apart.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eChanging the set\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eAll four cartridges in a tank take the same load and reach the end of their life together. When filter pressure climbs sooner after each cleaning, or the pleats stay grey after a soak, the set is done. Replacing all four keeps flow even across the rack, which is what a single new element among three worn ones cannot do.\u003c\/p\u003e","brand":"Unicel Filter Cartridges","offers":[{"title":"Default Title","offer_id":48625748869332,"sku":"UNI-051-9506","price":347.22,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0801\/9568\/2516\/files\/default_cd47e2d8-97b7-42d3-80d0-309cd93d3c28.jpg?v=1788691623","url":"https:\/\/www.activepoolsupply.com\/products\/cartridge-filter-set-130sqft-520","provider":"Active Pool Supply","version":"1.0","type":"link"}