QUOTE (Hognoxious @ Aug 23 2010, 08:25 PM)

If turning the knob doesn't make a difference (you should see and hear a difference - even with a quarter turn) then make sure the air-tube inside is not pinched. This happened to me and my solve was to cut a quarter inch of the tube off.
I clean the cup every 3-4 days and take the skimmer out and thoroughly clean every few months. Just gave it a good cleaning yesterday so mine is getting dialed back in right now. One thing I did notice this cleaning was some blockage in the clear plastic elbow, so I used the pipe-cleaner 'thing' that came with it and cleared that gunk out - so watch for that in the future.
Any one had an experience with this skimmer where it is producing bubbles, but the bubbles seem too large? No mater what level I keep my water, or how closed or open I adjust the screw the unit seems to be putting out either huge wet bubbles that don't develop skimmate, or smaller bubbles that can't get anything going either.
I'm not sure what could be the issue. I've removed and gone all over it. The only thought I had is that maybe water is somehow getting into the airline and disrupting the size of the bubble mixture, but that may not even may sense for this skimmer design.