Water filtration and purification units and replacement cartridges and filters; filters for air conditioners; filters and filtering devices for air and gas conditioning; filters for drinking water; air filtering installations; water purification installations; water filtering apparatus; HEPA filters for household use; aquarium filtration apparatus; swimming pool water cleaning and filtering units; air filters for domestic use; air cleaning units containing an air filter, ultraviolet lights and a photocatalytic filter; Water purifying apparatus and machines; water filters; air purifiers; filters, heaters and pumps sold in combination for use in swimming pools and hot tubs