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-   -   What about fermenting 3 gal batches in 5 gal carboys? (http://www.homebrewtalk.com/f13/what-about-fermenting-3-gal-batches-5-gal-carboys-385479/)

Odinperez 01-29-2013 02:57 AM

What about fermenting 3 gal batches in 5 gal carboys?
I would like to know your opinion about what could go wrong in fermenting 3 gal batches of beer in 5 gal carboys. I'm intending to do this because I don't want the krausen to get out of the air lock and all that kind of problems I have had sometimes when there's a lot of krausen forming, I know this is depending on the style, but with stouts I have allways had this problem.

Thank you!

lowtones84 01-29-2013 03:02 AM

I've fermented 3 gallon batches in 7.5 gallon buckets as well as a 6.5 gallon carboy. It was only primary though and I tried to keep it fairly short (2-3 weeks). So far I haven't noticed any problems despite the massive head space.

gbx 01-29-2013 03:04 AM

I split most of my 5gal batches between 2 6gal better bottle carboys. It works awesome.

Gavagai 01-29-2013 04:40 AM

1. Do it. Lots of headspace is no problem in primary.
2. Your only concern is krausen? Have you heard of a blow off tube?

Grantman1 01-29-2013 11:59 AM

I ferment 3 gal batches in a five gal carboy all the time, and never had any krausen close to the top. But if you're still worried, you could use a blow off like the post above mentioned.

Odinperez 01-29-2013 01:22 PM

Thank you all for sharing your experiences. This information is very useful to me!

Calichusetts 01-29-2013 02:01 PM

Better yet...brew 3.5 gallon batches in a 5 gallon carboy. If you need to secondary (fruit, oak, dry hop, etc) you can get a 3 gallon carboy and completely fill it, no worries of headspace and oxygen

bobbrews 02-01-2013 02:12 PM

Excess headspace in the primary is a non-issue... in fact, there may be some added benefits, one of which includes a thicker/denser 02 blanket to protect the beer. Excess headspace in the secondary however is certainly an issue.

Hopper5000 02-01-2013 02:17 PM

I've done it plenty of times with no issues (im doing 3.75 gal). Only tricky part is getting a gravity reading/sample as my theif is barely long enough.

brewfreeordie 02-01-2013 05:07 PM

I could see it being a problem in the secondary if the batch is pretty much fermented out, but there's so much CO2 being pushed out the airlock it must be completely blanketing the wort. I could see if you move your containers around a lot, but if you don't invade the space I don't see a problem.

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