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Old 08-01-2013, 09:28 AM   #1 
jadaBlu's Avatar
Join Date: Feb 2013
Location: Midwest
Sponge filter occasionally making a knocking noise?

I am not using any sort of pressure adjust valve the air pump is just going straight through. Do you know what is causing it?
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Old 08-01-2013, 10:56 AM   #2 
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Join Date: Jul 2012
Location: Ontario, CA
Its the air pump or the sponge filter? The subject line says sponge filter but you mention air pump in your post. If the air pump, is it touching anything, is there a cord laying on it? I would get an air valve, it makes a difference IMO.
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Old 08-02-2013, 01:25 AM   #3 
Join Date: Jun 2013
Shellieca hit the nail on the head. The first time I put the air pump on a shelf next to the tank I got a humming noise. I moved to the floor. The noise stopped.

Your air is not cut down which could cause the filter to bounce and hit the tank wall.
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Old 08-03-2013, 06:02 PM   #4 
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Join Date: Aug 2012
Location: Minneapolis, Minnesota
Yes air pumps are delicate, if they get bumped or at all misaligned they make very odd noises from vibrating against floors and walls and whatnot. They occasionally need to be adjusted.
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