What I want to know is can air go from the filter to the pump strainer (glass house). It would seem that when even off the plumbing has water in it constantly. Ive got alot of air in my pump strainer and im trying to track it down with no luck so far. Can air get into the underground line? I get no air bubbles from any of my plumbing coming from the ground to the pump strainer, when using dish washer soap and water spray.