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Posted by HeatPro on September 27, 2009 at 19:57:25:
In Reply to: Sludge in sight glass and in valve below posted by Jeff on September 27, 2009 at 19:25:25:
Drain the boiler. Remove the gauge glass valve fitting from the boiler, let it sit in vinegar for a day. Clean the holes in the valve and make sure it turns. Replace the fitting, reinstall the glass, refill the boiler to half glass.
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