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Posted by HeatPro on February 06, 2006 at 22:04:03:
In Reply to: heatpro.... posted by pete on February 06, 2006 at 09:27:04:
'Normal' operation is to gather some big bubbles then release them. Leaving them open all the time leaves a way for air in as well as out and can eventually create leaks and malfunction due to liming, so it is better to keep them closed and periodically open them for a while, then shut them.