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Home Brew Forums > Home Brewing Beer > General Techniques > How long will yeast last that you saved from a previous batch?
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Old 05-22-2006, 02:51 PM   #1
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Default How long will yeast last that you saved from a previous batch?

I am just curious,

If I save the yeast from a batch and refrigerate it, how long will it typically last before I have to either pitch it (trash it) or pitch it (use it)?

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Old 05-22-2006, 02:55 PM   #2
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It should be good for several weeks, possibly longer I'm sure.

If you want to hold it longer, it might be good to make a starter and "revive" it, then refirdgerate the slurry again. (I'm not sure I'd bother: I'm about to pitch a couple slurries that I have no plans to use anytime soon.)

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Old 05-22-2006, 02:55 PM   #3
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I've gone up to 3 months, but not longer. I've got some 1056 that is more than 6 months old that I might try and revive as a science experiment.

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Old 05-22-2006, 03:51 PM   #4
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IMHO, the length of time a yeast will survive depends on the sanitation procedures used.

In the end it all comes down to smell and taste.

It's logical that if you reuse a yeast from week to week that it'll stay viable longer than something you used 6 months ago.

As for store purchased yeast I have used yeast that was expired over 1 year. I just had to make a starter a couple of days sooner, but they worked fine.

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Old 05-22-2006, 04:43 PM   #5
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Thanks for the input.

I was going to get a small collection of yeast strains going, that way when I brew a belgian dubbel then I can use the proper yeast from a previous batch... so i'm not forced to use the same yeast in every batch.

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Primary: Porter Potty (oaked porter)
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last batch review(Schwheat (wheat))

Appear: 3.5/5.
Mouthfeel: 3.5/5
Carb/Head: 3/5
Taste: 2.5/5
Overall: 3/5

An overall decent beer but it has too much of a banana character, I think it's because of fermenting at too high of a temp. Tasted better as it aged, but far from perfect.

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Old 05-22-2006, 04:46 PM   #6
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I have a bunch of different yeasts in my fridge, both liquid and dry packets.

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