Water filtration and purification units and replacement cartridges and filters therefor; Air filters for air conditioners in vehicle passenger compartments; Aquarium filters; HEPA filters for household use; Air filtering installations; Air filters for furnaces; Air filters for HVAC units; Water filters; Filters for use with showerheads; Filters for extractor hoods; Filters for use with apparatus for ventilating; Air conditioning filters; Faucet filters