{"product_id":"poolpure-spa-filter-cartridge-prb25sf-50-micron-trilobal-50-sq-ft-media-replaces-unicel-c-4405-filbur-fc-2387","title":"POOLPURE spa filter cartridge PRB25SF 50-micron trilobal, 50 sq ft media — replaces Unicel C-4405\/Filbur FC-2387","description":"\u003cp\u003e\u003cstrong\u003eThe POOLPURE PRB25SF spa filter is a direct-compatible replacement cartridge designed to restore clean, clear spa and small pool water by trapping fine particles with 50-micron trilobal filtration fabric.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eWhen a spa or small pool filter needs replacing, the PRB25SF offers an engineered alternative to several OEM parts (Unicel C-4405, Filbur FC-2387, R172464) with NSF\/ANSI 50–tested materials and a durable construction that aims to extend service life and simplify maintenance. It’s built for reliable performance in both residential and light-commercial settings and is trusted by aquatic programs for consistent clarity.\u003c\/p\u003e\n\n\u003ch3\u003eHow does the PRB25SF capture fine debris?\u003c\/h3\u003e\n\u003cp\u003eThe cartridge uses a trilobal fiber weave and a 50-micron filtration layer to catch fine particles that ordinary filters may miss. This combination increases surface area for dirt capture and helps maintain water clarity between cleanings.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003e50 sq. ft. filtration area for high dirt-holding capacity\u003c\/li\u003e\n  \u003cli\u003eTrilobal fabric offers three times the adsorption surface versus standard fibers\u003c\/li\u003e\n  \u003cli\u003e50-micron media removes hair, sand, dust, and small organic debris\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWill this part fit my existing filter housing?\u003c\/h3\u003e\n\u003cp\u003ePOOLPURE PRB25SF is sized to match common replacements, making it compatible with several part numbers and many spa\/pool housings. Verify the dimensions and port openings to ensure a correct fit before purchasing.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eLength: 6 5\/8\" and outer diameter: 5\" for standard housings\u003c\/li\u003e\n  \u003cli\u003eTop and bottom openings: 2 1\/8\" to match common cartridges\u003c\/li\u003e\n  \u003cli\u003eCross-references: Unicel C-4405, Filbur FC-2387, Marquis 20342, R172464\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow easy is maintenance and cleaning?\u003c\/h3\u003e\n\u003cp\u003eThe PRB25SF is designed for quick rinsing and repeated reuse; its dirt-locking structure releases trapped debris during backwash or rinse, reducing scrubbing and replacement frequency. Routine care lowers long-term costs and keeps your spa ready for use.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003ePatented dirt-locking design lets trapped particles rinse away easily\u003c\/li\u003e\n  \u003cli\u003eReinforced core and heavy-duty fabric resist wear for longer life\u003c\/li\u003e\n  \u003cli\u003eSimple rinse with garden hose or filter cleaner extends service intervals\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat safety and performance standards does it meet?\u003c\/h3\u003e\n\u003cp\u003eMaterials have been tested for safety and durability, and the product aligns with widely recognized industry expectations for filtration components. POOLPURE participates in industry groups and third-party testing to ensure consistent results.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eIAPMO-tested against NSF\/ANSI 50 material-safety standards\u003c\/li\u003e\n  \u003cli\u003eConstructed with reinforced ABS end caps and a strengthened core\u003c\/li\u003e\n  \u003cli\u003eUsed in athletic training environments and endorsed by swim programs\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho is this for: The POOLPURE PRB25SF suits homeowners and property managers who need a dependable, cost-effective replacement for worn spa or small pool cartridges. It’s especially helpful for users who want finer particle removal, reduced maintenance time, and longer-lasting components without having to source OEM-labeled parts. If your current cartridge matches the listed dimensions and cross-reference numbers, this replacement is a practical choice to restore filtration performance and keep water clearer between services.\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: Is the PRB25SF a direct replacement for Unicel C-4405?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes, the PRB25SF is a compatible replacement for Unicel C-4405, Filbur FC-2387, and several other part numbers, matching listed dimensions.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: How often should I clean this cartridge?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Clean the cartridge when pressure rises or water clarity drops; typically every 2–6 weeks depending on usage and water conditions.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"POOLPURE","offers":[{"title":"Default Title","offer_id":54204671721656,"sku":"B08PZ8DFH2","price":113.01,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/0636\/7416\/files\/poolpure-front-packaging-view.jpg?v=1790636143","url":"https:\/\/canadianlawn.ca\/products\/poolpure-spa-filter-cartridge-prb25sf-50-micron-trilobal-50-sq-ft-media-replaces-unicel-c-4405-filbur-fc-2387","provider":"Canadian Lawn","version":"1.0","type":"link"}