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The anaerobic process by which yeast convert sugars into alcohol and carbon dioxide.

11 votes

Should I purge my carboy with CO2 before racking to secondary?

As Jack said, the CO2 given off during fermentation will provide a protective layer between your beer and the evil oxygen. If you want to be really safe, you could not use a secondary at all. … I only use them now if I am adding fruit or something to the beer during fermentation. Instead I just leave the beer in the primary for 3–4 weeks and then bottle. …
Billy Broas's user avatar