Aeroponics
These systems are generally expensive and are used by professional growers. The unit itself can be recognized straight away by its design. The plants are grown in a medium that is placed into slots along a lengthy tube. The tubes can run anywhere from 1 meter to 20 meters in length. Inside the tube are nozzles which mist down the roots of each plant with grow nutrients. The reservoir, which contains nutrients, is kept outside of the tube in a tank. The nutrients are pumped from the tank to the nozzles and then the remaining solution that drips from the plants is drained into another tank that is normally checked before being reused again.