Ebb & Flow (also known as Flood & Drain) is a system where a tray or bed of plants is alternatively flooded and then, drained with the required nutrient solution. The flooding of the media or plants acts to get rid of the stale oxygen in the media. Then, it draws fresh oxygen rich air to the root zone, when the system drains back into the nutrient tank.
This system is more suitable for longer-term crops, such as, trees and cut flowers where larger root masses are likely. Ebb & Flow systems always use some kind of media that can act as a buffer, in case of pump or electricity failure. Also, because the system is less active than an NFT system, the management of the nutrient solution is often less onerous than that of NFT.
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