Doubling the yeast

[java230]

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?

 

[rmyurick]

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.

 

[KepowOb]

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.

 

[java230]

Thanks guys, Yeast is left over from a batch I made sunday that ended in broken carboy

the OG was 1.069

 

[flars]

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.

 

[Setesh]

Also make sure to properly hydrate the yeast or half of them will die when pitched due to osmotic pressure.

 

[Heavywalker]

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.

 

[java230]

Thanks! So it sounds like having the left over pack is sort of a blessing in disguise then.... Sucks to lose beer though...