That is about the long and short of it. You also need a drain hole, mine are about 5-6 inches from the bottom. I top mine off daily with PH'ed water when they get some size on them. The smaller ones need to be checked every other day or so. I could probably get by with less frequent intervals on the watering but I am in there everyday anyway. When I top them off, I water until it comes out of the drain hole. I have it down now to the point where I can end up with a table spoon or two overflow. Once a week I add fresh nutes mixed according to the plants needs. In theory I can add nutes anytime they show signs of need since I am always in there all the time but the once a week schedule seems to be working fine for now. These plants are my first using this method so it is all a work in progress. I have seen the original hempy method (no airstone and a lower watertable) work well for people. I just wanted to try tweeking it a little with the added airstone. It seems to be working well IMO.