The Trojan 660001-R is an ultraviolet (UV) water filter system which is:
The Trojan UV Max K - Ultraviolet Water Filter System contains a 200 watt UV light that disinfects your home's water. This Trojan UV system is more effective than chlorine against a broader range of organisms. This UV light filter contains a stainless steel water chamber and has a safety cap. This UV disinfection system has 2 inch National Pipe Thread (NPT) inlet/outlet connections, and has a maximum flow rate of 80 gallons per minute (gpm).
The Trojan 660001-R specifications: