Air filters for domestic use; Apparatus for filtering drinking water; Commercial refrigerators and freezers and replacement parts and fittings therefor; Filtering units for water filtering, producing potable water for domestic use; Household air cleaners; Refrigerators and freezers for household use and replacement parts and fittings therefor; Water filtering units for aquariums; Water filters; Water filtration and purification units and replacement cartridges and filters therefor; Water purification apparatus; Water purification units; Water purifying apparatus for household purposes; Water treatment equipment, namely, cartridge filtration units; Water treatment equipment, namely, water filtration units; Water treatment equipment, namely, water filtration units and reverse osmosis units