Ultraviolet sterilization is useful for targeted elimination of microorganisms in air and water. UV sterilization leaves no residual chemical or radiation in the air or water and does not harm untargeted animals and plants. The treatment works well with waterborne pathogens but does not remove chemical or heavy metal impurities. Water should be filtered prior to UV exposure to improve the sterilization effect.
Sterilized microorganisms remain in the air or water.
Ultraviolet light penetrates the cells, but does not alter the water, air or food being treated. Nothing is added to the medium except energy. Dead bugs also are not removed from the sterilized medium. Nor are organic or inorganic particles in the water or air. Some organisms, like certain molds, are not as affected by UV radiation. UV radiation is indicated in situations where chemical residue after sterilization is not acceptable