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Title: Low air pressure, very loud.
Review: I read up on various pumps and decided to get this one. I plugged it in once I got it and it was really loud, none of my other pumps make any noise but this one makes a hum I can hear in my basement (it's on the first floor). I have two air hoses hooked up, one to a 48" flexible air tube and one to a 5" airstone. I figured this would be more than enough to power those two devices and it was - for about a month. Then the air tube had no bubbles but the disc was going great. I figured out that one of the air valves on the pump itself doesn't work any more. I'm going to a different brand completely and will sell this one with my smaller aquarium. It's great for a small tank but horrible for anything over 20 gallons (I used it in a 55 gallon).
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