Growing CBD seeds in a bubbling reservoir without any medium gives explosive vegetative growth and very fast root development, but a pump failure or a heat spike in the water can kill a plant in a day. It suits people who check their tent daily and own a thermometer. The hydro notes on https://calmcbdseeds.com are frank that several CBD lines with hemp ancestry dislike the constant wet roots and do better in coco. My one DWC run finished a week early but needed far more attention than soil.