as far as my system goes, i dont really know whether id classify it as open or closed. instead of a resivoir, i used a 1/2" pvc T and put fittings on two ends, and then a short length of pvc out the top to act as an air trap and a fill point. thanks for the help everyone. im going to re-examine my system and see if i can find any places where air may be leaking in. Its also damn hot in my room (i live in an unairconditioned dorm) and im wondering if the 80°F ambient temp is affecting it also...
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