A method and apparatus are disclosed for treating water, either potable water or a recirculated body of water, in which the water flows through a passage around and in direct contact with the surface of the germicidal ultraviolet lamp and in direct contact with at least one ozone producing ultraviolet...http://www.google.es/patents/US4752401?utm_source=gb-gplus-sharePatente US4752401 - Water treatment system for swimming pools and potable water
Water treatment system for swimming pools and potable water
