46 66 00 Ultraviolet Equipment
46 66 63 Open-channel Medium-pressure Ultraviolet Treatment Equipment
46 66 13Closed-vessel Low-pressure/Low-intensity Ultraviolet Treatment Equipment46 66 16Closed-vessel Low-pressure/High-intensity Ultraviolet Treatment Equipment46 66 23Closed-vessel Medium-pressure Ultraviolet Treatment Equipment46 66 53Open-channel Low-pressure/Low-intensity Ultraviolet Treatment Equipment46 66 56Open-channel Low-pressure/High-intensity Ultraviolet Treatment Equipment46 66 63Open-channel Medium-pressure Ultraviolet Treatment Equipment