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Mine gives off a whirring sound that I would expect given the volume of water being moved around. It's not silent by any means but I don't feel it is excessive. I've played with the alignment, and it doesn't seem to affect things much. I haven't diddled with the pin spacer. In any case it's much quieter than my return pump.
I run mine in reef crest mode, turned a little down (on a 4x2x2 120 gal mixed reef). If run at full speed the sand gets blown around something harsh. The pump is close enough to the surface that it occasionally sucks down air.
Overall, I'm very impressed with this pump; the only thing I'd love is if the single pump could reverse, so you could get real back/forth movement with a single pump.
Dan
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