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The flood and drain hydroponic system technique means flooding the grow bed with nutrient solution for some time and then draining it back again into the down tank. This procedure is happening on regular basis depending on a flooded pump controlled by timer.
Read more about at Hydroponics Flood and Drain System here http://www.aquaponicssystems.net/aquaponics-systems-basics/hydroponics/hydroponic-systems
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