I think they call it DWC. Basically it just a 32 gallon tote with 5 holes cut out the top for net pots. I drip fed until the roots hit the water and then took the drip pump out. There are 5 plants in that tote witth a 400watt MH (my 600 watt cooltube should be here tommorow) and 4 4ft flouros on each side. Right now i have 16 gallons in there with 4 air stones.:stoned: