{"product_id":"poolpure-4ch-21-spa-filter-18-sq-ft-1-5in-mpt-replaces-pdm25p4-fc-0121","title":"POOLPURE 4CH-21 Spa Filter – 18 Sq Ft, 1.5in MPT | Replaces PDM25P4, FC-0121","description":"\u003ch2\u003eMeet the POOLPURE 4CH-21 Spa Filter\u003c\/h2\u003e\n\u003cp\u003eEngineered as a robust replacement for a wide range of spa cartridges, the POOLPURE 4CH-21 delivers dependable filtration for spa water and helps your soak feel crystal-clear. With 18 sq ft of filtration area housed in an 8-inch cartridge, plus a 1.5in MPT connection, it fits many spa systems while keeping maintenance approachable and straightforward.\u003c\/p\u003e\n\n\u003ch3\u003eKey benefits you may notice\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003eNSF\/ANSI 50 CERTIFIED QUALITY confirms tested reliability for spa filtration.\u003c\/li\u003e\n  \u003cli\u003eAdvanced Dirt-Locking technology captures more debris than standard cartridges, helping water stay clear between cleanings.\u003c\/li\u003e\n  \u003cli\u003eTrilobal filtration fabric is designed to balance filtration efficiency with easy cleaning.\u003c\/li\u003e\n  \u003cli\u003eLarge filtration area (18 sq ft) supports steady flow and consistent spa performance.\u003c\/li\u003e\n  \u003cli\u003eUser-friendly design includes a top handle and 1.5in MPT bottom thread for straightforward replacement.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eThe cartridge is designed for straightforward maintenance rather than demanding backwashing. It is intended to support clean water through regular use and seasonal spa routines. Note that backwashing is not recommended with this type of media, as it may cause damage over time.\u003c\/p\u003e\n\n\u003ch3\u003eUsage scenarios\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003eResidential hot tubs and spas where water clarity and consistent flow matter for enjoyable soaks.\u003c\/li\u003e\n  \u003cli\u003eReplacement for a range of OEM models, including those listed in compatibility notes, with a flexible independent-brand design.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eCare and compatibility\u003c\/h3\u003e\n\u003cp\u003eTo keep performance steady, clean the cartridge monthly, rinse to remove trapped debris, and avoid backwashing, which can crack or damage the cartridge. Always ensure proper alignment with the 1.5in MPT threaded connection when installing.\u003c\/p\u003e\n\n\u003ch3\u003eWhy choose POOLPURE\u003c\/h3\u003e\n\u003cp\u003ePool and spa owners worldwide trust POOLPURE for dependable filtration and lasting value. The 4CH-21 is designed to work as a reliable replacement within a broad ecosystem of spa parts, helping you maintain water that feels inviting and clear after every soak.\u003c\/p\u003e\n\u003csection class=\"product-faq-snippet\"\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Why should I choose the POOLPURE 4CH-21 spa filter?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: NSF\/ANSI 50 certified for reliable filtration, broad compatibility, and a durable design for spa water.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: How should I care for this filter for best results?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Clean monthly, avoid backwashing, and rinse to restore flow and extend cartridge life.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"POOLPURE","offers":[{"title":"Default Title","offer_id":45788284846266,"sku":"B07YWF32RQ","price":107.83,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/3536\/8890\/files\/poolpure-4ch-21-spa-filter-side-view.jpg?v=1776502479","url":"https:\/\/gardencanada.ca\/products\/poolpure-4ch-21-spa-filter-18-sq-ft-1-5in-mpt-replaces-pdm25p4-fc-0121","provider":"Garden Canada","version":"1.0","type":"link"}