Water filtration and purification units and replacement cartridges and filters therefor; Air cleaning units; Air cleaning units containing an air filter, ultraviolet lights and a photocatalytic filter; Air filters for domestic use; Aquarium filters; Filters made of fiber for water filtration; HEPA filters for household use; Humidifiers for household use; Industrial electric oscillating fans for automatic cleaning of ceilings, light fixtures, ducts and other overhead structures exposed to fibrous airborne contaminants; Reusable capsules, not of paper and sold empty, containing a filter for use in coffee brewing machines; Swimming pool water cleaning and filtering units; Tap-water purifying apparatus