Greentree Hydroponics Multi Flow Analog Controller ModuleThis is the Greentree Hydroponics Multi Flow Analog Controller Module for the Multi Flow system. Though this controller is designed for the Greentree Hydroponics Multi Flow 12 Bucket Hydroponic System, it is compatible with nearly any hydroponic setup you can think of. This controller has a built in timer that controls watering times and flood duration. The controller is also equipped with water level sensors that maintain a steady watering height