The UV Pure Cactus Series, which is not NSF listed, comes complete with Crossfire technology. Its small footprint and compact size make installation applications endless and the upfront drop-down access panel makes bulb change-out a breeze. This series is engineered to reduce e-coli, bacteria, cysts and most viruses to safe EPA levels and comes with a "Lamp On" indicator that advises the owner the lamps are energized. Certified to California AB 1953 by NSF.