{"product_id":"darlly-spa-pool-replacement-filter-cartridge-42515-filbur-fc-6305-25-sq-ft-sonfarrel-c-4308-compatible","title":"Darlly Spa Pool Replacement Filter Cartridge 42515 Filbur FC-6305 25 Sq Ft Sonfarrel C-4308 Compatible","description":"\u003cdiv\u003e\n\u003cp\u003eKeep your spa, hot tub, or pool water crystal clear with the Darlly Spa\/Pool Replacement Filter Cartridge \u003cstrong\u003e[42515]\u003c\/strong\u003e, a trusted private-labeled alternative to the now-discontinued Filbur FC-6305. Designed for systems that rely on a 25 sq ft cartridge, this replacement preserves your filtration performance without requiring you to change your setup.\u003c\/p\u003e \u003cp\u003eKey dimensions that ensure a seamless fit:\u003c\/p\u003e \u003cul\u003e \u003cli\u003eOutside diameter: 4-15\/16\"\u003c\/li\u003e \u003cli\u003eLength: 14-9\/16\"\u003c\/li\u003e \u003cli\u003eTop opening: 2-1\/8\"\u003c\/li\u003e \u003cli\u003eBottom opening: 2-1\/8\"\u003c\/li\u003e\n\u003c\/ul\u003e \u003cp\u003eWhy this cartridge stands out\u003c\/p\u003e \u003cul\u003e \u003cli\u003ePrivate-labeled option: 42515 is a practical, cost-effective alternative built to match the FC-6305 footprint, making it a reliable substitute when official FC-6305 supplies are limited or discontinued by Filbur.\u003c\/li\u003e \u003cli\u003eCross-reference ready: If your equipment was originally configured for Filbur FC-6305, this cartridge is designed to drop in with minimal modification, helping you maintain your cleaning schedule and water clarity.\u003c\/li\u003e \u003cli\u003eModerate footprint, broad compatibility: With a 25 sq ft filtration area, it balances dirt-holding capacity and flow for common spa and pool filtration systems that use end caps and openings of the stated measurements.\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch3\u003eWho benefits most\u003c\/h3\u003e \u003cp\u003eThis replacement cartridge is ideal for homeowners, maintenance professionals, and spa\/pool enthusiasts who rely on a 4-15\/16\" OD, 14-9\/16\" long filter with 2-1\/8\" top and bottom openings. It’s an accessible, compatible solution for those who need a dependable FC-6305 alternative without changing their filtration hardware.\u003c\/p\u003e \u003ch3\u003ePractical tips for best results\u003c\/h3\u003e \u003cul\u003e \u003cli\u003eBefore installing, confirm your system’s compatibility by comparing the cartridge footprint and end-cap dimensions with the 42515 specifications.\u003c\/li\u003e \u003cli\u003eRinse the new cartridge under clean water to remove any loose debris from manufacturing.\u003c\/li\u003e \u003cli\u003eFollow your spa\/pool’s maintenance plan for replacement timing based on usage, bather load, and water quality to keep filtration at peak performance.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e","brand":"Filbur Manufacturing","offers":[{"title":"Default Title","offer_id":40241551802410,"sku":"FC-6305","price":43.74,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0574\/4014\/1354\/files\/42515.jpg?v=1769976124","url":"https:\/\/bathparts.com\/products\/darlly-spa-pool-replacement-filter-cartridge-42515-filbur-fc-6305-25-sq-ft-sonfarrel-c-4308-compatible","provider":"Bath \u0026 Spa Superstore","version":"1.0","type":"link"}