{"product_id":"cartridge-130-sqft","title":"Pentair OEM Filter Cartridge, 130 Sq Ft for Clean \u0026 Clear Plus 520","description":"\u003cp\u003eThe Pentair R173578 is the genuine 130 square foot cartridge element for the Clean and Clear Plus 520 filter. It measures 7 inches in diameter and 32-1\/16 inches long, with a 3 inch center hole.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eFour to a filter\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eThe Clean and Clear Plus 520 runs four of these elements in the tank, and four at 130 square feet each is where the 520 in the name comes from. This listing covers a single element, so order four for a complete change.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhen to replace them\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eCartridges do not last forever. Fibers pack with oils and fine debris that no amount of hosing gets back out, and the sign is a starting pressure that creeps up season after season and no longer drops after a cleaning. Replace all four together: the elements age at the same rate, and putting one new element beside three worn ones sends flow unevenly through the tank.\u003c\/p\u003e","brand":"Pentair","offers":[{"title":"Default Title","offer_id":48627947733204,"sku":"RAI-051-3578","price":186.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0801\/9568\/2516\/files\/default_c178071c-71ea-4670-827f-c108c4d77217.png?v=1788730590","url":"https:\/\/www.activepoolsupply.com\/products\/cartridge-130-sqft","provider":"Active Pool Supply","version":"1.0","type":"link"}