Originally Posted by Ramses
It's more than anything curiosity. Just wondering what would happen if I threw the started yeast into my primary? Would it benefit from additional yeast?
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Most likely, nothing would happen and it would be a waste of yeast. Are you at, or close to, your expected FG?
The first 3 days or so are when the most yeast cell division happens. You should have an ample yeast count in the beer by now that would render your new yeast useless.