I am a new homeowner and thus a new (and confused) pool/spa owner as well. The jets on the spa are not working properly, and none of the folks who have looked at it seem to have a clue (although I haven't gotten a spa specialist out yet).
First, to get the jets to pull in any air, I have to turn the pump up pretty high, possibly because my filter needs a cleaning. That would not be a problem, BUT....
When I do that, water flows OUT the air intake pipes in the deck! It seems impossible to me that water is flowing OUT of those while there is air coming through the jets, but that is what happens.
There is one jet that is a particular problem, and the air intake pipe that shoots the water out most is connected to that jet. This jet has clearly greater water flow than the other 3. Now, I have drained the spa and looked into the jets and noticed that it appears this problem jet is missing a piece. I believe it is the nozzle. But I would think that NOT having the nozzle in would result in the water just flowing out of the jet faster, without causing the backup into the air pipes. Is that totally wrong? If I just get the nozzle installed in there, would this jet properly draw air into the jet and thus fix the problem? I can't conceptualize much of this well.
I've attached a pic of the water flowing out of the air intake pipes. (It looks like it uploaded upside down, no clue why...) Not sure that is very helpful, but at least we know I am not making this all up.