The UV light is one of the four methods approved by the USFDA. It will disinfect filtered water at normal flow rate, providing one of the safest filtering systems available. Bacteria, viruses and other micro-organisms are destroyed by interfering with the DNA and RNA in the organisms' reproductive cycles.
Once the UV light is on, it is recommended to not turn off the power unless it is necessary. Powering down the UV lamp causes the lamp to shorten its life.