Air from return jets

[PoolDoc]

Well, I wish you luck! Hunting for suction leaks has never been one of my preferred tasks!

[mas985]

Don't forget to lube the pump drain plug. That can also be a source of an air leak.

Also, if all else fails, some people have had success using shaving cream on the joints to find out where the plumbing is leaking as it will get sucked into the joint.