Question only one of four jets has anything coming out of my spa attached to my pool. I can see standing water in the vent pipe. I tried blowing into the air intake with a vacuum which produced air out of all jets.water is now in vent pipe again and only one jet produces bubbles
Sorry for delay.
Is it occured now from beginning since I can think of wrong connection or if it afterwards then it could be some debris in the nozzle.
Remove the nozzele faceplate pass MS wire (ones used to binding reinforcement in concrete) it will flush all debris if it is present.