The nine-site Aero Machine evenly distributes oxygenated nutrient solution directly to plant roots via microjets and a high-output pump. Great for rooting, propagation, and growing plants to maturity, this highly-productive system protects roots from light with plastic root guard lids for each plant site. Growing medium is not required however expanded clay pellets, silica stone, or similar can be used in the net cups for additional plant support. Unit measures 29" x 24" x 18".