I've been reading about tunze return pumps for a few month now and found them to be interesting so I pulled the trigger. So far it's the best return pump I have ever owned. I can adjust the pump flow from 230 gph to 900 gph. Its also low energy consumtion it uses 24 to 40 watts. I can't even hear this thing running. I had to walk up to the tank twice to make sure the tank was running.
