The Liquitron Conductivity Controller is a microprocessor based control system that will operate in a variety of water treatment applications. The DC4500 provides a set point and relay for conductivity control, and a variety of timer functions to control chemical addition, including dual biocides. Pumps may be controlled in either ON/OFF or External Trigger mode. Programming this controller is simple and is accomplished using only three keys. The backlit LCD display and LEDs provide a visual indication of operating conditions and equipment status.