this grow i did use rockwool and my clones are in rockwool but i would try other mediums i don't know what dwc or nft mean and all i know about kbs is that you use that method will you please explain the differant systems abit i am interested in kbs trees, but co2 tank is hard to get for me the local hydroponics store needs to see my drivers licence for my to bye it... but i live in suberbs so co2 isn't bad i think and good ventilation, i don't think i need that risk, i use rockwool in big white tubs with a drip system