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When should I see the signs of fermentation?

If White Labs or Wyeast fermentation will begin 5-15 hours after pitching. As the yeast nears its 4 month shelf life fermentation will begin somewhat later, usually between 15-20 hours. The first sign of fermentation will be a raised airlock. This signals CO2 production. A fine layer of foam will begin forming on top of the liquid. Within a few hours the head of foam will become thicker and rocky , and the airlock will rapidly expel the CO2 gas. Fermentation will usually be complete in 7-14 days, depending on the strain, starting gravity and ferment temperature.

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