Elk Grove Village, Ill.-based Rainsoft, a division of Aquion Partners LP, unveiled a new series of ultraviolet water disinfection units. The RS Series Ultraviolet Water Disinfection Systems provide a reliable, chemical-free option for homeowners concerned about Cryptosporidium and Giardia lamblia cysts, bacteria and viruses. The units are completely self-contained, making installation, maintenance and service easier. The control, an upgrade from the previous UV system, is resistant to voltage fluctuations.