Lalbrew London ESB Yeast - Aggressive

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Dec 16, 2020
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So put my first batch of Best Bitter down last week and had to go out of town for a few days. When I got back the fermenter had blown off the bung and even lifted the lid of the plastic bucket fermenter a bit. I cleaned it up and replaced the bung and took a gravity reading. The OG was 1.044 and in 3 days it went to 1.013. Fermentation temp was 18 C but had dropped to 15 C as my heater for that room shut off. Has anyone else had this experience with this yeast being so aggressive? This batch basically finished in 3 days! See attached chart. Will this affect the flavour?

Thanks in advance.


  • best bitter ferm chart.pdf
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Hi there. It's normal for that yeast and many other English yeast. I would however raise temperature back to 20-22C to make sure the yeast finishes and cleans after itself.