Originally Posted by Brew-boy
You mean rinsed yeast, washed is where you add acid to lower the PH. Anyways I would not keep it past 3-4 months but that is just me and what I have learned by doing it. Your mileage may vary.
Washed is a pretty common term for cleaning up yeast out of a primary fermenter by simply rinsing with sterile water a few times and storing. In homebrewing, at least, I'd say they're interchangeable. Acid washes are pretty uncommon outside of professionals circles, and even a lot of pros don't do it.
Anyway, to answer OP's question, as long as everything was nice and sterile when you were washing your yeast, it should keep for months in the fridge.
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