The Culligan Aquada Maxima 4 is a 4 gallon per minute point-of-use system and is their advanced system. The Maxima series offers UV water disinfection with additional features such as micro-computer controller, visual and audible alarms, easy button reset for alarm and computer, and a power connection for an optional solenoid safety shut-off valve. The Maxima also comes with a UV intensity monitor and digital display. Find Culligan compatible parts for other Culligan UV systems.