Figure 5.

(I) A nutrient film hydroponic system comprised of two water pumps (A,B), two reservoirs (C,D), a watering line (E), a grow trough (F), a drainpipe (G), and a sterilization system (H). (II) Water is pumped from the storage reservoir, through the watering line, and down the grow trough where it runs around the roots of the plant. The nutrient solution then drains out of the grow trough, and is fed back to a central reservoir through the drainpipe. The nutrient solution is then filtered and sterilized to remove particulates and pathogens.