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Fermentation: Stuck Fermentation

Problem:

Fermentation may begin successfully with signs of active yeast, and then appear to stall without reaching the target final gravity.

Causes:

  • The wort is insufficiently aerated, meaning the yeast did not have sufficient oxygen to begin its activity.
  • Not enough yeast is used to get fermentation underway.

Cures:

  • Ensure sufficient aeration occurs when transferring the wort into the fermenter, prior to pitching the yeast.
  • Prepare a yeast starter, especially for higher gravity worts, to ensure sufficient yeast is available at the time of pitching into the wort.
Fermentation: Stuck Fermentation