Trojan UV Max: ultraviolet (UV) lamps disinfect water for residential and commercial applications. These lamps create light at 254 nm wavelength, this wavelength disinfects bacteria and viruses. The UV system installs on the inlet pipe to your house while neutralizing bacteria. A UV lamp purifier should be installed in every home suspect of coliform bacteria for safe drinking water. A must for rural homes or cities where water quality is questionable. A 5 micron pre-filter sized to your application is required. Additional pre-treatment may be required to properly use this disinfection technique. Start with a water test.