The Model AT 1500 UV disinfection system from Norweco reduces bacteria levels from secondary effluent to achieve strict water-quality standards, the company states. The compact design minimizes the amount of excavation required and allows for a quick and easy installation. A corrosion-resistant solid-state circuit board continually monitors system performance, which ensures disinfection quality, according to the maker. The system is UL-listed as a residential treatment device. 800/667-9326; www.norweco.com.