Water purification systems comprising ultra violet irradiation lamps, valves and controls sold as point of use units orpoint of entry units for industrial andmunicipal water purification by vertical UV disinfection, horizontal UV disinfection, closed chamber UV disinfection orpressure UV disinfection; water purification systems comprising ultra violet irradiation lamps, valves and controls sold as point of entry or point of use for residential units and spas water purification by vertical UV ...