>Whistlin’ Dixie

by Grape Stomper Todd on September 16, 2009

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Yay, the Chardonnay is fermenting! How do I know? Well, when it whistles, I know! Yeah, there are other ways to tell. I do get out my hydrometer to measure sugar levels. But I know things are going great when the relief valve on the bung is starting to sing!


You see, when the yeast eat the sugar in the grape juice, about 55% of it gets converted into alcohol. Much of the rest gets converted into carbon dioxide (CO2). The CO2 builds up pressure in the barrel and we use a special bung to let the gas escape. Otherwise the bung would get shot across the winery, or worse…the barrel would explode!

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