THE EBB AND FLOW SYSTEM (FLOOD AND DRAIN
The Flood and Drain System or Ebb and Flow System, works by
temporarily flooding a tray and then draining it immediately
This operation is conducted by using a pump controlled by a timer, which makes it an Active Hydroponic System.
The solution is drawn out of a container by a pump, led to the bench or tray where the crops are being cultivated, and once the pumping has ceased, it returns to the container usually by draining through the same pump.
The timer is calibrated to repeat this cycle various times a day ās necessary, according to the type of plant, its size, temperature and humidity and the type of growing medium being used, as may be the case.
The growing bench or tray can be made in two ways.
In the first case, one uses a platform fixed to the edges of the bench on which the plants are anchored, and where the root system remains suspended in air or, where only the roots extremities are dipped in a thin film of solution left permanently inside that tray.
Today, this setup is outdated, although many still use it.
The second and more common case consists of filling the tray or culture bench with a growing medium in which one anchors the plants' roots.
The growing medium must be biologically sterile and not decomposable.