Air cleaning units containing an air filter, ultraviolet lights and a photocatalytic filter; Air filtering installations; Air filtering units; External ballast and bilge water filtering and absorbing device for use in a local containment area for removing aquatic nonindigenous species, oil and other contaminants from the effluent; Filters for air conditioning; Filters for drinking water; Filters for water filtering apparatus; Fitted covers for water filtering apparatus; Household tap-water fi...