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Home Brew Forums > Home Brewing Beer > Fermentation & Yeast > Double batch...double yeast?
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Old 01-29-2011, 02:44 PM   #1
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Default Double batch...double yeast?

This weekend I will be doing a double boil 10gallons.

Do I need to use double the yeast?
I usually use the smack packs from NB.
(my logic using 1/2 the norm... Yeast multiplies so rapidly does it really matter if I start with 1/2 as much. I am assuming, if you recommend I do this, it will take a little longer to get going and complete)

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Old 01-29-2011, 02:47 PM   #2
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It will take longer to get going. It is normally recommended to make a starter with liquid yeast, even for a 5 gallon batch. You should be making an even larger starter for a ten gallon batch. Use the Mr. Malty calculator to figure out how much you should be pitching.

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I'll make my buddy do it with me next time. That'll make me go harder at it.
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Old 01-29-2011, 03:08 PM   #3
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Yeah use the calculator... for some styles pitching low to stress the yeast a bit and get extra phenols and esters might be appropriate, but for most beers (especially lagers) it is not. Your starting gravity also has a lot to do with how much yeast you should pitch... When I do 10 gallon ales of 1.050 gravity or less I usually make about a 4 liter starter with one pack/vial or about a 2 liter starter with 2 packs/vials. Put it on the stir plate for a day or two, chill, decant, and pitch the yeast.


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