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Homebrewing

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  • Even though your lid may be airtight, that only keeps more air out. There's already air inside the bucket, unless you purged with inert gas, and that air could contain wild yeast. Also as you mention, fruit could harbor microbes and you didn't remove that. It would be helpful to know more about the process (were the berries fresh or frozen? Were they ever boiled?), but it does sound like you've got some spontaneous fermentation going on. Commented Apr 3, 2015 at 15:25
  • @FranklinPCombs The berries were fresh and washed before the stems were cut out. The fruit was not boiled; it was kept at room temperature. The bucket was not purged; I just put the lid on, so I must have trapped some air in the 1inch headway I had between the must and the lid. Commented Apr 3, 2015 at 21:17
  • Makes sense. see @TobiasPatton 's answer, in that case. Commented Apr 3, 2015 at 21:19