Culligan R50-BBSA WPCFF975, FM-BB-10-50, ECP50-BB, W50CPHD, FXHSC AND WHKF-WHPLBB Alternative 50 Micron Water Filter Replacement Cartridge Qty(4) by KleenWater Four cartridge value set, pleated polypropylene construction 50 Micron Sediment Rating with 20 gallon per minute flow rate Compatible with wide body & "Big Blue" housings Culligan R50-BBSA 4.5" X 9.75" dirt/sediment filter cartridge