Hello everyone, I am having a problem with my pump/filter. I'm getting a lot of air in the system, there's bubbles coming from the returns and there's also a couple inches of air in the pump strainer pot. I have checked the o-ring and lubed it, last night I got a can of shaving cream & sprayed it around everything going up to the pump. I didn't really see any areas that looked like they were leaking air. I also raised the water level in the pool a bit since it was a little low, but that didn't seem to help either. The pressure on the gauge is only running at about 5psi until the filter gets pretty dirty and then it will go up to 10-15.
Oh and I have a 20,000 gallon in-ground vinyl liner with a sand filter. Nothing has been changed on the plumbing recently either. If you have any other thoughts of things for me to check please let me know!