Questionable yeast for stout.

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Has a krausen formed on top of the wort?
 
yes you can repitch yeast - what strain and how was it packaged originally and what are you now thinking? in a pinch US05 dry will prob get it going if you are having struggles.
 
About 1/4” of Krausen.

So, assuming the krausen hasn't actually started to fall, the fermentation might have just got off to a slow start (e.g. due to temperature or pitch rate). Personally, I rarely advise pitching additional yeast. It's almost never really necessary.

If you're thinking about re-pitching, I'd recommend at least measuring gravity before making that decision.
 
Be patient, ive made a RIS with nottingham and it took a month for the fermentation to be complete. And it ended great. Mine was 8.5 % ABV
 
I agree, if you have krausen then your yeast is working. What temp are you fermenting at?

I'd wait another 6 days or so then take a gravity reading so you'll know for sure. If it's dropped close to FG then move it to around 70 degrees for a few days to let the yeast clean up after themselves then package.
 
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