A series of WaterFarms can be interconnected with a Controller
supplying nutrient and water automatically to all the units. A
13-gallon master reservoir filled with fresh water and mild nutrient is
positioned on top of the float-valve activated 8 gallon Controller. As
the plants draw nutrient from their individual reservoirs, the
Controller's level drops, causing the float valve in the Controller to
open and draw fresh nutrient from the master reservoir. The ideal
nutrient level is maintained in all the interconnected units for days
or even weeks.