Got one of these for christmas. It actually looks a little different from that, but anyway, it's pretty much exactly the same. Anyway, results are fantastic. This produces such very fine bubbles that most of them are actually held under the water by the water pressure above them. This means that they move across the length of the tank dissolving even more CO2. It's great. If you're thinking of getting one, just go ahead and order it right now, you wont regret it. I'm hoping I'll be able to cut down from 2 diy co2 bottles to just one.... fingers crossed.