The air is coming from somewhere, and obviously it's not supposed to be in the system. I'd start with the easy things, like checking the seal on the top of your pump strainer basket, the multiport gasket, and the pressure gauge and sight glass, and tightening the drain plug on the bottom of your filter and the knob on top. Beyond that, sounds like you may have a leak in the line somewhere, but I'll need to let the equipment experts weigh in on that one...
Janet
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