reeferkeeper420 link said:
Just stops producing bubbles. Water is still flowing.
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I think you should take the pump off and check it all out again. But first, if take the pump off and leave it in the water, then blow through the air line, you should see bubbles come out. If not, there is still something clogged, which is really the only thing that can be wrong if water is still flowing through IMO.
I also read that they are very sensitive to where the air line is, it should only be about 3" above the water line.