SOAK & DRAIN

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SOAK & DRAIN

	This method applies to larger hydroponic systems than the ones which have been considered so far.
	A waterproof growing container is placed on a bench and sloped to an outlet to which a hose is connected.
	The other end of the hose is connected to a bucket or drum which contains the nutrient solution.
	When the container is held above ground level the growing container, the nutrient solution will flow out and soak the growing medium.
	When the bucket or drum is lowered, the excess nutrient solution will drain out of the medium back into the bucket.

	The size of the container should be limited to approximately 18 litres, as any larger would make lifting difficult for students.
	The container is then topped up with water for the next irrigation.
	Completely renew the solution every 1-2 weeks.
	The medium must not be left totally flooded during hot weather because this will cause rapid root death.
	It is advisable to retain a small reservoir of solution in the bottom of the container to carry plants over a weekend or during periods of hot weather.