Hydroton is a porous clay pelleted medium ideal for all hydroponic growing applications due to its free draining capacity and is inert, clean and dust free. It can also be added to growing mediums for additional aeration for bromeliads and orchids. However we strongly recommend you flush the medium before use in aeroponic and hydroponic systems. Also available in 50 liter bags.Call 828-299-9989 or email newagegardens@gmail.com for bulk orders