NSF International’s drinking water treatment standard has recently updated it to allow a more efficient method of treating microorganisms in drinking water. The revision to NSF/ANSI 55: Ultraviolet Microbiological Water Treatment Systems establishes new criteria for use of UV-LED technology for microbial reduction and provides a new test method to certify manufacturer claims. Treatment systems covered by the standard use UV light to inactivate or kill bacteria, viruses and cysts in microbiologically unsafe water (Class A systems) or to reduce the amount of...