Unicel 2 New C-8413 Pool Spa Replacement Cartridge Filters 125 Sq Ft Sta-Rite Industry's most complete line of replacement filter elements Sta Rite (25230 0125S) (Note: Verify OAL of Pro Clean 125 and 150 to identify correct Unicel replacement) Waterway Plastics (817 0125P) (Note: Verify OAL of Pro Clean 125 and 150 to identify correct Unicel replacement)