I can't say I know a lot. I've been doing this for several years and mostly work from experimentation. They're are so many who really grasp the technical side. At this point I'm working with the system I've got (not the best, I think) and experimenting with it. I'm hoping to take one of my media beds and develop a wicking bed using the soft grow bag material. I saw this in Oma RIchards system and think it will be better than just dirt in my grow bed with a barrier between it and the rocks below. Hope this makes some sense.