If your water comes from a private well or lake and you worry about the microbiological safety of the water, Rainfresh UV Water Disinfection system could be the solution that you have been looking for. The Rainfresh UV system disinfects water by using the natural, non-chemical disinfection properties of ultraviolet light to inactivate bacteria, coliform bacteria (e.g. E. coli), viruses, parasitic cysts and other microorganisms.