A recycling system. Sometimes called Ebb and Flow. This system normally consists of potted plants or plants in cubes being placed on shallow self draining trays.
Photo: 1-hydroponics.co.uk
The trays are flooded intermittently or according to a program, the media saturated and the excess being permitted to either flow back to the bulk plants in the system can occur.
Flood and drain system
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ThanateTan