I'm doing DWC now, with two buckets, look at my other posts to see pics in progress... they got out of control... let me rephrase... I let them get out of control... they were so big I had to do some serious topping... anyway... at first you won't need to fill the water as much, but once they get big... they will drink water faster than you can believe. My plants right now have been in flowering for a week after a 6 week veg, and I fill the bucket up to 2" from the top... after two days a third of the bucket will be emptied. I've done Ebb and Flow, which is more difficult to setup and I see no advantage to either. All depends on your budget, and how much you want to be involved. The one recommendation I can say, is I've tried the PowerGrower drip system from GH... and realized with just a seedling, there is so much water-to-air contact that the water evaporates almost 5 times faster, and thus you're filling it up every other day... not a good system. Sorry, I type a lot... I get excited about hydro.