What a difference 1C makes to fermentation.

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BrewHouse

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I just thought I would make a comment about the difference I have seen this weekend in my latest brew.
I did a 36L batch of Dry Irish Stout using Wyeast 1084 Irish Ale Yeast.
The batch went into 2 FVs with a smack pack in each. Both in the brew fridge, one on top of the other.
The FV at the bottom, just above the tube heater is sitting at 20.2C and is racing away already. The top one has not yet got up to temp and is only at 19.1C. This one has only just got going and output through the airlock is perhaps 10% of the bottom FV. Both Smack Packs were from the same batch and so I can only assume that the different levels of activity are due to the 1C diff in temp. I am absolutely amazed that such a relatively small diff in temp can have such a huge effect.
 
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