Abstract: A system to remove contaminants from water includes, in the pressurized water flow lines, a venturi nozzle assembly to entrain air in the water, a pressure tank to store and deliver the air laden water, an aerator/precipitator tank assembly to remove the excess air and any residual gases from the water in the pressurized system and to remove contaminants from the water and a filter tank having a filtration bed therein to remove the remaining precipitated contaminants from the water and to deliver the water to service.

Abstract: A water filter adapted for installation in the hot and cold water supply lines leading to a faucet, appliance or the like includes a housing containing a granular activated carbon filtration bed and a two position valve with three ports for controlling water flow through the filtration bed. The valve has a first service position for normal flow of cold water through the filtration bed to the effluent line from the water filter and a second backwash position for flow of hot water through the filtration bed in an opposite direction to then drain through the same effluent line.