I'm having an issue with my pump strainer. When the pump is off the strainer assembly is full of water all the way tp the lid but when you turn the pump on it just about empties out. The suction line from the pool to the pump will constantly flow water into the strainer but the water never fills up more than maybe the height of the strainer basket inside the assembly. The pump seems to be pumping the water but I have very little flow from the jets in pool and alot of air bubbles. I'm guessing that the pump is pulling air in from somewhere? I replaced the O ring on the strainer lid this morning and that didn't fix the issue. I poured water over all the PVC connections associated with the pump and strainer basket but found no air bubbles or places where water sucked in. Anyone had this issue before or know what else I can check or try to do? Guy at pool store said I may have a hairline crack in lid and I could try to replace the actual lid.