Opening the pool, Before I prime the pump, I read I should unscrew the top of the sand filter and release any air. After I open it, do I screw the lid on the sand filter shut and prime the pump or should I leave it open until it is primed? If I leave it open, will the water shoot out of the top? I have installed all of the plugs where they belong and used my robot to clean and stir up the water. The next step is running the pump.