Super-Pro XtremeBlue A1 C4025/C4030 Filter Cartridge, 4-pack | X15-ULT-A1-M-Q4 C7370 Scrubber wear often coincides with

Scrubber wear often coincides with wear on other contact surfaces — servicing them together reduces downtime and repeat disassembly

Confirm your BioShield unit's model number (522638 or 522945) before ordering — both are 150W units but are listed separately in Pentair's parts documentation

a damaged seating surface will cause a new O-ring to fail prematurely

Your Pentair / Purex CF-105/315 filter requires 3 cartridges for a complete service

featuring a 5/8-inch ID shaft bore

Super-Pro XtremeBlue A1 C4025/C4030 Filter Cartridge, 4-pack | X15-ULT-A1-M-Q4 C7370 Scrubber wear often coincides withSuper Pro aftermarket filter cartridge replacement for use with the Hayward C4025 & C4030 cartridge filters. This is a 4 pack, for full filter servicing. For a single filter cartridge, see here.