Lately I've been noticing air building up in my filter. When I open the little valve on top, I get about 5-10 seconds of air coming out before the water starts flowing. It seems to be about the same amount of air whether I crack the valve once a day or once a week which suggests to me that there's a certain maximum volume of air that builds up in there and once it's reached, no more new air enters.
I don't know if that makes any sense. But like I said, if I check it once a day or once a week, the amount of air coming out seems about the same.
Any idea what's happening here and why? Should I be concerned?
I'm running solar heating which may(?) contribute to air leaks in the system