{"product_id":"pentair-r173578-cartridge-replacement-cnc-plus-520","title":"Pentair R173578 Cartridge Replacement - CNC Plus 520","description":"\u003cp\u003e\u003cstrong\u003eWhat This Part Is Used For\u003c\/strong\u003e\u003cbr\u003ePentair R173578 Cartridge Replacement - CNC Plus 520 is a replacement filter cartridge for Clean and Clear Plus 520 filtration systems. It removes debris and fine particles during normal circulation.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhy This Part Matters\u003c\/strong\u003e\u003cbr\u003eA clogged or aging cartridge reduces filtration performance and increases system pressure. Replacing it restores proper water clarity and balanced flow. Clean cartridges help protect pumps and heaters from strain.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eKey Features and Specifications\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eManufacturer part number: R173578\u003c\/li\u003e\n\u003cli\u003eReplacement cartridge element\u003c\/li\u003e\n\u003cli\u003eFor Clean and Clear Plus 520 filter systems\u003c\/li\u003e\n\u003cli\u003eCartridge style filtration\u003c\/li\u003e\n\u003cli\u003eRemoves suspended debris\u003c\/li\u003e\n\u003cli\u003eConfirm exact filter model before ordering\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eInstallation and Fitment Guidance\u003c\/strong\u003e\u003cbr\u003eRelieve filter pressure and remove the tank lid before replacing the cartridge. Inspect lid O-ring and sealing surfaces during service. Confirm by manufacturer part number before ordering.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eAbout the Pentair Brand\u003c\/strong\u003e\u003cbr\u003ePentair manufactures high capacity cartridge filters widely installed in residential pools. Their Clean and Clear Plus series supports strong water clarity with minimal maintenance. Pentair provides OEM cartridges for consistent performance. The brand is trusted by pool professionals.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCommon Service Context\u003c\/strong\u003e\u003cbr\u003eThis cartridge is typically replaced when filter pressure rises after cleaning. It is also installed during routine seasonal maintenance.\u003c\/p\u003e","brand":"Pentair","offers":[{"title":"Default Title","offer_id":52078597996818,"sku":"R173578","price":183.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0733\/2279\/1186\/files\/PENR173578_0.jpg?v=1772562686","url":"https:\/\/www.aquaterrabackyard.com\/products\/pentair-r173578-cartridge-replacement-cnc-plus-520","provider":"Aqua Terra Backyard","version":"1.0","type":"link"}