The 3M™ Ultraviolet Water Disinfection System sterilizes your home's water supply against harmful microorganisms, bacteria, mold and viruses. The 3M™ Ultraviolet Water Disinfection System uses ultraviolet light for sterilization against water-borne microorganisms, mold, bacteria, or viruses such as coloform, e.coli, cryptosporidium, or giardia. This is an especially important step to take for homeowners who have received a positive coloform, e.coli, cryptosporidium, or giardia water test result, who have well water or private water systems, or those with reason to suspect that they are at higher risk for such contamination. It is also beneficial for families seeking to have piece of mind that there water is being properly disinfected prior to consumption. The use of the 3M™ Ultraviolet Water Disinfection System does not introduce harmful chemicals into your drinking water and has no taste or odour.