SmartStream UV disinfects water using ultraviolet lamp technology. It inactivates a variety of microorganisms, including cysts, bacteria, viruses and parasites. Those organisms, if ingested, could lead to serious illness and even death.UV light is highly effective, capable of inactivating up to 99.9999% (6-log) of harmful organisms. In addition, the UV disinfection process requires no contact with toxic chemicals and, as a result, produces no harmful by-products. Auto Lamp Dimming reduces energy consumption by up to 46% during no-flow conditions.GPM RatingPower (watts)System Model #RESIDENTIAL SYSTEMS (LP)"A" STANDARD (NO DIMMING)214T7402000621T7402003829T74020011240T7402004"B" ADVANCED LP LAMP WITH DIMMING110T7401200214T7401200625T7401200832T74012001232T7401200