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 and hot tubs; Filters, heaters and pumps sold in combination for use in hot tubs; Filters, heaters and pumps sold in combination for use in swimming pools; Storm water filtering units featuring non-metal filtering booms and tendrils used to reduce bacteria and hydrocarbons in standing water; Swimming pool water cleaning and filtering units; Water filtering apparatus; Water filtering units for domestic, commercial, and industrial 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, ice makers