Is 40F cold enough to store harvested yeast?

Yeast should be used as soon as possible and not stored for long periods before re-use (longer than 2 weeks). Yeast should be maintained between 34°to 36°F (1-2°C) in an oxygen free dark environment. Warmer temperatures and oxygen exposure will increase the rate of culture degradation. A slight amount (<5 lbs) of head pressure can be applied with CO2 to maintain a positive pressure environment. Excessive pressure can be detrimental to the culture.

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