Create a low-maintenance garden with General Hydroponics Controllers. Simple, reliable and inexpensive, General Hydroponics Controllers consists 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 Master Reservoir sits on top of the Controller and holds additional nutrient solution. As plants draw water from their individual reservoirs the liquid levels drop causing the float valve in the Controller to open and draw fresh nutrient solution from the Master Reservoir above. This automatically maintains the ideal nutrient solution level in all the connected units.

Standard Controller
13 gallon reservoir and an 8-gallon controller including all the hardware needed to build your own system

The Standard Controller is straight-sided, with a 13 gallon capacity.

Dimensions: 12"W x 12"L x 3’6"H

Texas Controller
20 gallon reservoir and a 20-gallon controller to build a Texas sized system

The Texas Controller is round, with a 20 gallon capacity.

Dimensions: 2'W x 2'L x 3’6"H

Panda Reservoir

The 40 gallon Panda reservoir has a white exterior to reflect light and heat and is black on the inside to discourage algae growth. The Panda’s sleek design allows it to be placed into tighter spots and optimize garden space. The convenient access hatch makes nutrient changes a breeze. Float valves and drain kits are also available to make your growing system simpler and more efficient.

Dimensions: 48”L x 24”W x 13”H

Find a store near you that carries GH Controllers and Reservoirs.