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Old 01-21-2009, 11:41 PM   #1
Dec 2008
Madison, Wi
Posts: 25

I want to start to make smaller batchs so I can do some experimenting and comparisons. For a 2.5 gallon batch can I use a 3 gallon carboy as a primary fermenter?
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Primary - APA
Secondary - Russian Imperial Stout
Bottled - Nothing
Kegged - Nothing

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Old 01-21-2009, 11:44 PM   #2
Post Hoc Ergo Propter Hoc
Revvy's Avatar
Dec 2007
"Detroitish" Michigan
Posts: 40,945
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That's what I use...I have a mix of 3 gallon water jugs, mr beer fermenters and betterbottles for my small batch experiments..Like this...

You will find plenty of info on here if oyu search for "small batches" I have posted a bunch of info, and recipes.

Have fun!

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Old 01-22-2009, 12:17 AM   #3
frolickingmonkey's Avatar
Sep 2008
Whatcom County, WA
Posts: 331

Originally Posted by HalloweenGod View Post
For a 2.5 gallon batch can I use a 3 gallon carboy as a primary fermenter?
Yep. I've used 3 gallon primaries for a few half batches... worked perfectly!
Primary: Delicious Beer
Secondary: Delicious Beer, Delicious Cider
Kegeratin': Delicious Draft Beer
Bottled: Delicious Bottled Beer and Cider

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Old 01-22-2009, 02:57 AM   #4
bsay's Avatar
Jul 2008
Fort Collins
Posts: 572
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Sometimes you need a blow off tube, but I usually just switch out the airlock when it gets full of junk.... I've been doing 2.5g all-grain lately, primary in a 3gal BB.
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Brewing 2.5 gal batches with a 2gal cooler MLT in my cramped apartment. Pictures coming soon!

Ask me about my Keezer/2.5 gal brew setup!

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Old 08-22-2013, 03:29 AM   #5
Dec 2010
McMinnville, Oregon
Posts: 3,273
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another to add with "i have a 2.5 gallon brewing setup and am fine in 3 gallon carboys"... good luck! sometimes the fermentation gets crazy... just had a 1.080 stout blow off three times
Coming up Mosaic Honey Wheat -
Primary Kool-aid malt liquor - Berlinerweisse
Kegged Berlinerweisse - Centennial blonde with Huell Mellon hops - same blonde but dry hopped with ella
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Old 08-22-2013, 10:05 AM   #6
Nov 2010
Solway, MN
Posts: 10,242
Liked 1943 Times on 1541 Posts

You could also do your 2.5 gallon batches in a 6.5 gallon fermenter bucket if you have one. They work great and you never have to worry about a blowoff tube.

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