Water purification installations and parts therefor; Waste water purification units; Water purification and filtration apparatus; Water treatment equipment, namely, water filtration units and ozone sanitizers; Ozone generators for water purification installations; Water treatment systems comprised of biologically active filtration apparatus, ozone water treatment units, metal and non-metal tanks and pipe, pumps, mixers, air diffusers, filter media, and automated process control systems, namel...