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Yeah no kidding. That loud hum was surprising. It does make a good alarm when you're out of water though....it goes from loud hum to "who the heck is shaking that can of marbles...oh yeah, need more ATO water."Agree with above post. I bought a used Tunze 3155 from here about 1 1/2 ago, and its still working great. Pump is loud, but I think that is just the Tunze pump in general.

