Air in pool return lines

[Waterworks]

Bubbles in the return line indicate a suction side leak. Most of the time the leak is caused by a faulty pump cover o-ring. Have a look at your pump basket and see if there is a lot of air in it while the pump is running. When you turn the system off you might actually hear air escaping around the cover. If not, remove the cover and inspect the oring. More than likely the oring is faulty.

Brad
www.waterworkspools.com

[Pool in Carolina Blue]

Thanks Brad. I pulled the pump cover and the O-ring looks fine. I lube it every two weeks or so. However, when I turned the pump off, I noticed a slight water leak at the pvc connection to the pump. Not a lot of water, but a small leak nonetheless. It looks like to prior owner tried to "seal" it with some sort of gray colored liquid cement. Could this be the source of the air?

[duraleigh]

Could this be the source of the air?

If it's on the suction side of the pump....yes. If it's on the pressure side.....no