There are three different types of grow systems; Top Feed, Flood and Drain (Ebb and Flow), and Aeroponics.
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With Top Feed systems, water and nutrients are fed from the top producing 10% more yield using 30-40% less water and nutrients -- the greenest way to grow and the way Hydroponics Unlimited recommends. Flood and Drain (Ebb and Flow) floods the entire tray with water and nutrients from the bottom allowing the plant to absorb the water and nutrients and then drains within 10 minutes. With Aeroponics, roots are suspended in a dark grow chamber where the roots are misted with oxygen rich nutrient solution 24 hours a day. Proper distance in any grow system between plants should be between 14 to 16 inches.