I read the reviews and I knew that this would not be "quiet", but I was not ready for how loud it truly is. Maybe it does a great job. Maybe it's better than diaphragm pumps...that's all well and good, but if you can't be within 30' of the tank because it's so loud, it is a waste. We put this in the tank cabinet and turned this on with the air valves off. The sound that came from the pump was the equivalent of a loud TV. There is no way to have a normal conversation in the same room as this pump when it was running. As a test, I turned it on, closed the cabinet, and made a call from my speaker phone that is about 10' from the tank, and the person on the other line asked me what the noise was without me prompting them. So, while this may very well be a solid product for what it is supposed to do, it is just too noisy to be practical in most situations.