About

A packaging type of liquid yeast, comprising a pouch containing both yeast and a small plastic sachet of nutrient. A few days before use, the nutrient is "smacked" (squashed between hands), releasing it into the yeast. The yeast ferment the nutrient, producing CO2, which inflates the main pouch. The puffed up pack is an indicator of yeast viability and readiness for pitching.

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