I really should have brought this up with my PB, but I didn't. One of the jets in my spa barely works. It bubbles some and there's a little bit of water coming out of it. When I drained the spa last spring to clean out the drains, I took a peek inside that jet and saw a white hex bolt looking thing centered and at the back of the throat. I figured out what size it was and got a deep welled six point socket with extension and wrench ready. After filling the spa back I gingerly turned that bolt clockwise, and did not see any change, so I tried counterclockwise with no change. Below is a picture of the jet housing during the pool's construction
Does anyone recognize this, and was I heading down the right track with the socket wrench.