Ultraviolet disinfection of the treated effluent ensures the protection of the environment for direct discharge application or disposal by means of spray irrigation. The Model AT 1500 Ultraviolet (UV) disinfection system provides reliable treatment without chemical addition. The Model AT 1500 UV disinfection system reduces harmful pathogenic bacteria levels to below recreational water quality standards, particularly with the high quality effluent provided by Singulair treatment systems. The compact design of the system minimizes the amount of excavation required making installation quick and easy. Ultraviolet disinfection is routinely used in ecologically sensitive areas where residuals from chemical disinfection could possibly create problems in the receiving environment.