Re-Hydrating Yeast

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I've never rehydrate yeasts and never had a problem.
BUT.. I bottled an IPA last week where the m44 yeast took 2.5 days to get in to the swing of things and my first early (purely scientific) taste is peculiar. Astringent sort of.
Not sure if it's because it's quite a bitter ipa and it's still under carbd or needs a bit of conditioning or if it's yeast stress....
 
I have been re-hydrating yeast for years, but recently tried a different method: I sprinkled the yeast on to the wort and left it for 15 minutes. I then stirred the whole lot very vigorously with a stainless steel pain stirrer in the electric drill, The result was a much faster start to fermentation (and one job less on my brewday). That's what I shall do from now on.
 
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