ok thats what im using 18 gallons container 10 to 12 gallons of water an feed..now when i using my pvc pipe set up(there is a name but cnt remember right now) it held 5 plants an i only used 5 gallon container had a water pump pump the water to it 24 hours an my plants love the stream of water coming thru the pipe never seen them grow that fast.only reason why i dnt keep using it is bc limited of space for what i want to do..now im using a 18 gallon container with 10 to 12 gallons of water with 3 air hoses an they are just doing great. reason i like your idea is bc at the top, well the roots not in the water im worry abt them dring out so thats why i cnt wait to put a system like urs in to play an leave the water pump on 24 hours i dnt see why not..