Have had this running as an in-sump pump for my 225 gallon aquarium for about 2 weeks now. Absolutely no problems with it, and it is DEAD silent. I can't hear it running at all, even when I am right in front of the sump. Good, strong flow, runs quiet, good warranty, and is repairable if something happens to the impeller. One concern I had going in was what kind of heat might be added to the tank by using this submerged, but the difference in temp has been negligible (maybe 1 or 2 degrees, if at all).Would recommend to anyone looking for a submersible pump, have not tried it externally.
Rating: [5 of 5 Stars!]