Every morning when my pool pump starts running, it has to pump large volumes of air out of the system before water emerges from the jets. There has been a leak under the pump for some time. (It's a Pac Fab Challenger 1hp.) I changed the housing gasket - still leaked so I changed the pump shaft seal (PS200) - still leaks! If I mess around and pull the housing off, then put it back together, I can maybe change the volume of the leak, but after the pump cycles off/on a few times it gets worse again. I tried loading the gasket up with silicone lube - that didn't help. I tried it dry, still no good. Any ideas?
Also, what's the difference between the square housing gasket I'm using and the round o-ring I just heard about today? Different model years?