The UV Pure Hallett 15xs Ultraviolet Water Purification System with Crossfire Technology is NSF/ANSI 55 Class A certified. This system comes with a patented 316 stainless steel self-cleaning mechanism and on-board automatic purge valve virtually eliminates quartz fouling, manual cleaning and quartz tube removal. Its small footprint and compact size make installation applications endless and the upfront drop-down access panel makes bulb change-out a breeze. Certified to California AB 1953 by NSF.