Air cleaning units containing an air filter, ultraviolet lights and a photocatalytic filter; Air filtering units; Air filters for domestic use; Apparatus for filtering drinking water; Baths, bathtubs, whirlpool baths and bath installations; Filtering units for water filtering, producing potable water for domestic use; Filters and filtering devices for air and gas conditioning; Filters for drinking water; Filters, heaters and pumps sold in combination for use in hot tubs; Filters, heaters and pumps sold in combination for use in swimming pools; Hot tubs; Refrigerating appliances and installations; Water filtering apparatus; Water filters; Water filtration and purification units and replacement cartridges and filters therefor; Water filtration and purification units and replacement cartridges and filters therefor for refrigerators, ice makers; Water purification and filtration apparatus; Water purifying apparatus for household purposes; Water treatment equipment, namely, cartridge filtration units; Hot tub filters; Water purifying units, for potable water for domestic, commercial and industrial use