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Old 06-17-2014, 03:46 PM   #1
java230
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Default Doubling the yeast

Will doubling the yeast cause any real problems? I have an extra Safeale US05, and was wondering about throwing it in my next brew (also uses us05). Any harm? not worth it?

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Old 06-17-2014, 03:51 PM   #2
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Shouldn't cause any harm and may be recommended, depending on OG and yeast viability. Check out the yeast pitch rate calculator at MrMalty.com.

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Old 06-17-2014, 03:53 PM   #3
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As rmyurick has said, it might be a good idea, but it really depends on the OG of your recipe. Generally 1 pack of dry yeast is fine unless your getting into big beers. If you don't need it, why bother putting it in there, just save it for your next batch.

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Old 06-17-2014, 04:02 PM   #4
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Thanks guys, Yeast is left over from a batch I made sunday that ended in broken carboy

the OG was 1.069

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Old 06-17-2014, 04:13 PM   #5
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Quote:
Originally Posted by java230 View Post
Thanks guys, Yeast is left over from a batch I made sunday that ended in broken carboy

the OG was 1.069
Two packs of rehydrated US-05 would be warranted for a 1.069 beer.
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Old 06-17-2014, 04:46 PM   #6
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Also make sure to properly hydrate the yeast or half of them will die when pitched due to osmotic pressure.

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Old 06-17-2014, 04:49 PM   #7
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There is about 20 billion yeast cells per gram of dry yeast (US-05) properly rehydrated yeast loses about 25% viability so you are left with approximately 150 billion cells, which is fine for a standard gravity beer. However a 1.069 beer will require around 300 billion cells so pitching two packs of properly rehydrated yeast is a good idea.

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Old 06-17-2014, 05:01 PM   #8
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Thanks! So it sounds like having the left over pack is sort of a blessing in disguise then.... Sucks to lose beer though...

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