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I posted on here recently about air in my system. In the spring I plan to replace my air scoop with a spirovent and get estimates to reconfigure my three zone hydronic heating system to pump away (the book was fascinating). This year for some reason a purge only lasts a few weeks before the air is back. Can air scoops 'go bad'? My AAV on top of the scoop is doing nothing and I have replaced it recently. Also one of the zones hardly ever gets used. Could water be evaporating in it creating air pockets that get circulated around?