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Home Brew Forums > Home Brewing Beer > Beginners Beer Brewing Forum > Fermenting smaller batches in 5 or 6.5G carboys
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Old 11-10-2011, 05:02 PM   #1
TheGrouch
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Default Fermenting smaller batches in 5 or 6.5G carboys

Is there any reason I can't brew a 3 gallon batch and ferment it in a 5 gallon carboy? Or even a 6.5G carboy?


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Old 11-10-2011, 05:05 PM   #2
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THe only reason i can think of is that there may be a higher chance of oxidation.


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Old 11-10-2011, 05:16 PM   #3
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There won't be a higher chance of oxidation. There will be a nice layer of co2 above the wort to protect it.
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Old 11-10-2011, 05:19 PM   #4
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Initially, that was my leading concern. However, the surface area of the wort exposed to air is the same, whether you put 2, 3, 4, or 5 gallons in a 6.5G carboy. So I don't see how the risk of oxidation is any greater than a full batch.

I suppose one could argue that a smaller batch will take longer to produce enough CO2 to cover the surface area of the wort, but how much longer would that be? A few hours at most?
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Old 11-10-2011, 05:38 PM   #5
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Nope, nothing wrong with it. I do it all the time.
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Old 11-10-2011, 05:39 PM   #6
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5 gallon is about the biggest I would go, and have gone, with 2.5 gallon batches. Though I really try normally to have no more than a "gallon" worth of headspace in my fermenters. You can go with 2.5 in a 5 if you have no other options. I wouldn't use a 6 or a 6.5 though.
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Old 11-10-2011, 07:01 PM   #7
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Revvy - What is the reasoning behind that guidance?


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