I have a set of steps with 2 jets. Each one has the adjuster for air flow at the top of the step - I like to keep them opened quite a bit because I like the look of the bubbles.

Anyway - I am having trouble getting the bubbles this year. If I opened the turn knobs all the way i use to get a nice flow of bubbles from both jets. Now I am getting nothing. As a matter of fact on one of the valves if I open it up water comes out of it.

Any idea what the problem may be?