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Old 12-04-2012, 05:37 AM   #1
Nov 2012
Posts: 422
Liked 19 Times on 19 Posts

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?
Primary: None
Bottled: Cinnamon Apple Cider, Two Hearted Clone, FW Double Jack Clone
Kegged: House Pale Ale, Russian Imperial Stout, Milk Chocolate Stout/Porter Partigyle, Graff
On Deck: DIPA w/Heady Topper Yeast, Winter Warmer, Imperial Red

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Old 12-04-2012, 05:41 AM   #2
Jul 2012
Nelson, Bc
Posts: 537
Liked 49 Times on 39 Posts

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
Calichusetts's Avatar
Nov 2011
Plymouth, MA
Posts: 3,011
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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
Sep 2011
!, !
Posts: 1,286
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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
zzARzz's Avatar
Jul 2012
Posts: 416
Liked 47 Times on 39 Posts

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
AnOldUR's Avatar
Mar 2007
, New Jersey
Posts: 6,887
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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
Oct 2010
Astoria, NY
Posts: 357
Liked 24 Times on 17 Posts

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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