Keep your spa, hot tub, or pool water crystal clear with the Darlly Spa/Pool Replacement Filter Cartridge [42515], 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.
Key dimensions that ensure a seamless fit:
- Outside diameter: 4-15/16"
- Length: 14-9/16"
- Top opening: 2-1/8"
- Bottom opening: 2-1/8"
Why this cartridge stands out
- Private-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.
- Cross-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.
- Moderate 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.
Who benefits most
This 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.
Practical tips for best results
- Before installing, confirm your system’s compatibility by comparing the cartridge footprint and end-cap dimensions with the 42515 specifications.
- Rinse the new cartridge under clean water to remove any loose debris from manufacturing.
- Follow your spa/pool’s maintenance plan for replacement timing based on usage, bather load, and water quality to keep filtration at peak performance.
