Water filtration and purification units and replacement cartridges and filters therefor for drinking water; Apparatus for filtering drinking water; Air conditioning filters; Faucet filters; Filters for air conditioning; Air filtering units; Reverse osmosis membrane filters for water treatment; Water filtration and purification units and replacement cartridges and filters therefor; Household tap-water filters; HEPA filters for household use; Water treatment equipment, namely, cartridge filtration units; Swimming pool water cleaning and filtering units; Water filters; Water filtering units for drinking water use; Air filters for air conditioning units; Personal water filtering devices in the form of straws; Filters for swimming pools; Filters and filtering devices for air and gas conditioning; Water filtering units