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Old 12-04-2012, 05:37 AM   #1
bfinleyui
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Default 3 gallons in a 5 gallon carboy?

I've got a 5 gallon better bottle, and was thinking of doing a smaller, 3 gallon biab ag batch on my stove (apartment living means no garage or yard to do full ag batches)... I know too much head space in secondary could cause issues, but i'm assuming that if I use the 5 gallon bb as a primary, that would be filled with co2,and not cause issues?


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Old 12-04-2012, 05:41 AM   #2
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I worry about what is in the headspace before the CO2, and never getting it all out. I might try inverting the bottle, flushing it with CO2 while it's upside down, and then carefully racking the brew into it. Still, I'm kind of paranoid about airborne microbes.


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Old 12-04-2012, 11:17 AM   #3
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My advice (if you want to secondary) is to do a 3.25-3.5 batch and get yourself a 3 gallon carboy. That way, you will completely fill the secondary and not have to worry about headspace. Hope this helps
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Old 12-04-2012, 11:20 AM   #4
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Yes you can use a 5 gallon BB for a primary on a 3 gallon batch,no problems.
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Old 12-04-2012, 11:26 AM   #5
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I've done several 3 gallon batches in my 5 gallon carboy without any ill effects. The extra space is especially nice when racking onto fruit and the like.
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Old 12-04-2012, 11:39 AM   #6
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I commonly brew 7-8 gallon batches and split the wort between two 5 gallon carboys.

So, I'm another one saying, no problem.
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Old 12-04-2012, 12:00 PM   #7
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I do 3 gal batches in my 5 and 6 gal carboys all the time. Just never secondary in a vessel with that much headspace and you'll be fine.


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