US Pure PWS #20 BB Water Softener Filter Cartridge for Hard Water The US Pure Water Softener water filter removes hardness from your water supply in order to prevent unwanted water stains and scale formation. Ideal for Deep Well Water Supplies and Areas with Hard Water Supply Guaranteed High Quality and Safe Specifications: Length: 20" (50.8 cm) Diameter: 4.57" (11.6 cm) Fits Standard 20" Big Blue Filter Housings Filter will fit a standard filter housing size of 20” BB from any brand. A Quality Product brought to you by WaterCare. #WaterCare #Water #Filtration #Filter #Softener #WaterSoftener #Cartridge #20 #BB #20BB #Replacement #Hard #Hardness #HardWater #Treatment #WaterTreatment