Air Bubbles in Return Line

Aug 29, 2011
I have air bubbles in the return line to the pool. There are no air bubbles in the skimmer at the pump. There are no visible leaks anywhere. I took apart the top valve and cleaned it and soaped all the o-rings. put it back on and No bubbles. Today I cleaned and vacuumed the pool, backwashed the filtier, and no have air bubbles again. I took the valve apart again, cleaned and soaped it but this time did not fix the problem. My guess is that it is time for a new top valve. All chemical levels are good and otherwise the water is clear. Just hazy from air bubbles. :)


Mod Squad
TFP Expert
Apr 4, 2007
SW Indiana
Your valve is unlikely the source of your bubbles. Air can only get into the lines before the pump since the water after the pump is under pressure. Do you have an SWCG?
Aug 29, 2011
No SWG, When the pump is off there are no visible leaks in any exposed lines prior to the pump. Lines are buried at least 18 inches and under concrete.
Aug 29, 2011
Thanks, I will check the lines the best I can and replace any ones that look matginal. The air bubbles do come and go for no apparent reason.


Well-known member
Jul 9, 2010
Do you have a solar heater that is fairly high. If so you might have a small leak in one of the lines above pool level

Took me over month to figureout and find mine as it diddnt let water out but sucked air in through a joint that was glued but not primed