Fermentis SafLager W-34/70 is a widely used German lager strain originating from the Weihenstephan institute. It is known for a clean, balanced fermentation profile.
Fermentation characteristics
- Sedimentation: High
- Final gravity: Medium
How to use
Match the total yeast quantity to the wort volume, original gravity and intended fermentation conditions. Follow the current sachet directions for pitching and temperature rather than assuming one pack suits every lager batch.
Compare Fermentis lager yeast strains
These bottom-fermenting strains produce different balances of neutrality, fruitiness and sedimentation. Match the yeast quantity and fermentation temperature to the wort volume, gravity and intended lager style.
- SafLager S-189 – neutral Swiss lager strain with high attenuation and fast sedimentation.
- SafLager S-23 – Berlin-origin strain for fruitier, more estery lager styles.
Important: Yeast strains are not interchangeable. Use the pitching rate, temperature and handling directions for the exact sachet and recipe.

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