Air cleaning units containing an air filter, ultraviolet lights and a photocatalytic filter; Air filtering installations; Air filters for domestic use; Air filters for heating and cooling registers; Filters for air conditioning; Filters for drinking water; Filters for fluids, namely, for water and area-water solutions; Filters made of fiber for water filtration; HEPA filters for household use; Water filtering units for commercial use; 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