I have two RS250s. I don't notice any pump noise at all. There is some noticeable air intake noise, but what I find to be the noisiest of these skimmers is the actual foaming action. However, this is not to say that it annoys me. Heck, one of them is in my bedroom and I sleep with it on. Occaisionally I will unplug it as sometimes after cleaning it really ramps up and takes a day or two to "break in" again, but 95% of the time I'm satisfied. Long story short, I got used to it. It's the only "real" skimmer I've owned (compared to a Prizm Pro. Ha!) so I'm not one to compare EuroReefs to other "real" skimmers.
HTH and cheers,
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Mark.
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