Air cleaning units containing an air filter, ultraviolet lights and a photocatalytic filter; External filtering device for use in a local containment area for removing oil and other contaminants from storm drain effluent as it exits storm water systems; Filtering units for water filtering, producing potable water for domestic use; Filters for drinking water; Filters for fluids, namely, for water and area-water solutions; Filters, heaters and pumps sold in combination for use in swimming pools...