Yup I agree, if it leaks down faster when the pump is running, it is definitely on the effluent side of the pump.

As for how they fixed the leak in the skimmer throat, they used waterproof epoxy that the kneaded together and stuffed in the crack. They said it wouldn't be a permanent fix, but 1.5 years later, it's still holding fine. If it gives up, I'll go buy some more and stuff it in there!

Michael