I recommend a brain bucket system, or at least that's what I think its called. The system consists of up to 12 2-3 gallon buckets. Each bucket is really two buckets, one holding the expanded clay with many little holes on the bottom to allow the water to rise up and the other has a hose attached and floods every few hours submersing the expanded clay in hydro juice. I like it because the buckets are cheap to buy at home depot and the fittings are cheap at the hydro shop. Its easy to rig another bucket and add it to the line. You only need to make a brain bucket to fill the others. I made my own with an old bucket, it cost me 3 dollars to make, I just bought the 1/2 inch rubber grommets to stick into the buckets and put a 1-1/2 over flow drain at the point I want the water level to stop rising. My brain is gravity drained, so only one pump is needed, but a store bought brain is better cause is can sit on the floor with the reservoir, mine has to be above the water line on the res so it can drain.