Water filtration and purification units and replacement cartridges and filters therefor; Apparatus for filtering drinking water; Air filters for domestic use; Water filters; Air filters for heating and cooling registers; Household tap-water filters; Air filters for furnaces; Air filters for HVAC units; Faucet filters; Air conditioning filters; Drinking water filters; Hot tub filters; Filters for ice making apparatus; Swimming pool filters; Filters for use with apparatus for steam generating; ...