My pool is three years old and I've never had a problem with air in my pump basket. So this year, got the pool opened and boom...air in pump basket. I've checked every union at the equipment pad. I installed a new o-ring and lid on the pump. I had the pool company remove the chlorinator because I was almost positive I could air either going in or coming out when the pump was off. They also took apart the top to my sand filter and lubed the gasket. No luck. So here is what is happening....there is air bubbles in my basket when operating. My clean PSI last year was about 15 and it's about 18 this year. So when I turn my pump off in the evening and come back in the morning, the pump basket is about half full (sometimes more, sometimes less. My equipment is about 3 feet above my pool (had no other choice). The pool doesn't lose prime per se, because it fills up the pump basket almost immediately, which I would think if this is a suction side leak, I would completely lose prime due to the elevation of my pool equipment. Also, if I close the suction side valves, I still getting a lot of air in the pump basket overnight. Any thoughts or suggestions? I will be spending a week at the lake several times this year and do not want to stress about this while I am gone.
As a side note, there was two days last week where it rained a lot and I had almost no air in the basket during those two days. That let me to believe there is a small leak on piping somewhere, but could just be a coincidence. My only thoughts are I have an issue with my sand filter or piping. But one would think that if the leak was after the pump and I turn my suction side valves to closed, the air wouldn't back up into the pump.
Any help would be greatly appreciated.