Why si my aqua clear powerhead blowing bubbles in the tank

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SteveD

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Apr 1, 2004
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Why is my aqua clear powerhead blowing bubbles in the tank

I have an aquaclear 402 model with the air tube un attached and the prefilter installed. There is no place for air to get in, so I cannot figure out why I have tiny bubbles. The only things I can think of.

The pre filter?
The air tube hole being unplugged yet under water?
 
Last edited:
How long has it been plugged in and running? If less than a month, try turning it off, and then rotating it several times, in all directions, under water. They can get air trapped in them, and this will spew out for a while.

If it's been up for longer than a month, how far below the surface is it?
 
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