xon432246
Member
After I remove the wort for bottling from my primary fermenter can I add new cooled wort into the same fermenter with the same yeast to start another batch or do I have to remove the yeast cake and clean the fermenter?
Reusing Fermenter Without Cleaning
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Snowhere
Well-Known Member
I would remove the cake and clean the fermentor. Just the thought about the old krausen sticking to the sides could be a tougher to clean would make me do it. I think you would be relatively ok just pitching on top of the old cake, but why take the chance. Just a single bacteral organism getting in with the air could ruin your next batch. That is why we wash our yeast and give it a sniff test before we repitch it. An off flavor would be a signal that the yeast is compramised and not to use it.
Hophazard
Well-Known Member
Just drain and pitch on top of it. Unless you've left it uncovered outside for 3 days, it'll be fine. With that many cells, the yeast will outcompete almost anything out there.
It's a long-standing debate, but I cast my vote with this answer.
Here's a long thread about the issue: https://www.homebrewtalk.com/f163/why-not-pitch-your-yeast-cake-166221/
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