I don't think it's loud at all, it's pretty nice and quiet. It's in my basement, I don't spend a lot of time by it. But it doesn't bother me, it's like a white noise humming. I don't know if you'd have trouble sleeping next to it, but its not very loud at all. Especially because it's a loud room. I mean, the fans in the lights are much louder than the pump. I can hardly hear it at all between the fan and the lights.
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