20 gallon reservoir and a 20-gallon controller to build a Texas sized system!
General Hydroponics Controllers consist of two connected reservoirs that help to ensure an ideal nutrient level is maintained in hydroponic systems. The Controller is the reservoir that sits on the bottom and has a float valve connected to a line of growing units.
The Texas Controller is very simple - a container with a float valve is connected to the line of units. A master reservoir filled with fresh water and nutrient is located on top of the float-valve actuated Controller. As the plants draw water from their individual reservoirs, the liquid levels drop causing the float valve in the Controller to open and draw fresh nutrient from the master reservoir. This automatically maintains the ideal nutrient level in all the interconnected units, simple, elegant, reliable and inexpensive.
Dimensions: 2' W x 2' L x 3'6" H