It has a noise muffler on the air intake. You can see it in the above picture beside the beckett housing. The pump isn't overly noisey but it is fan cooled so it does make some noise. It would be best if you could enclose it somehow, then you'd hardly hear it, but I'm not sure I would have it running out in the open in my living room. Let alone any noise, it wouldn't look too good once it's pulling the gunk out of your tank.
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