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Ebb and flood or otherwise known as flood and drain systems provide nutrient solution on timed intervals, from a tank to the holding platform on top where  plants or seedlings get flooded for short periods of time. This short intervals of flood combined with drain time in between is essential for roots to not drown. Oxygen to the roots help with the absorption of nutrients that the plants need to grow. This system is ideal for making seedlings, especially using our Growers Foam, even Jiffy bags or substrates such as vermiculite, potting soil, however is not a good medium for the flood and drain system as the water retention properties make it difficult for sufficient drainage.