Blisters

From the choices you have made the problem you are experiencing
is most likely to be caused by problems with :

Gas produced from reaction between glass and other material	Ingress of air / Combustion problems
Pieces of brick dropped into glass Metal dropped into glass Glass level above channel washing mortar into glass Channel joint wear Electrode wear Excessive power from electrodes Excessive current to earth electrode when utilising furnace boost Oil contamination Welding slag	Cracked spout bowl Cracked or badly sealed orifice ring Cavitation from stirrers Stirrers operating in wrong direction Cavitation from plunger nose Reboil normally on amber glass caused by flame on surface Reboil normally on amber glass caused by excessive reheating glass surface in forehearth (Entry temperature too low)

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