Preserve and protect household plumbing and water-using appliances with the Culligan HF-150A Whole House Sediment Water Filter. Installed on the 3/4-inch main water line at the point of entry, this filter housing features a pressure relief button used at cartridge change time. The UV-resistant opaque filter material facilitates outdoor installations when necessary. Because water quality varies among locations, the HF-150A is sold without a filter cartridge. There are several replacement cartridges to choose from including; Culligan model S1A, CW-F, P5,P1, and SCWH-5.