Microorganisms can exist naturally in water and include bacteria, viruses, Cryposporidium and Giardia. Drinking water containing any of these organisms can result in illness. Culligan UV systems utilize the proven disinfection ability of ultraviolet light to provide a safe and effective method of providing in-home protection against water-borne illness. Your Culligan Man can help you make the right decision when it comes to providing a clean and safe drinking water supply for your family!