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Old 02-09-2012, 09:25 PM   #1
jeremy586
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Default Can my Carboy be too big?

I keep having a problem with stale paper towel tasting beer. I'm sure it's a oxygen problem. I usually ferment in a 6.5gallon carboy and fill it to about 4 or 4.5gallons of wort. I top off with burst of co2 and am always carful when using my auto siphon into a keg. Is the 6.5gal carboy to big for a 4gal batch?

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Old 02-09-2012, 09:28 PM   #2
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Originally Posted by jeremy586 View Post
I keep having a problem with stale paper towel tasting beer. I'm sure it's a oxygen problem. I usually ferment in a 6.5gallon carboy and fill it to about 4 or 4.5gallons of wort. I top off with burst of co2 and am always carful when using my auto siphon into a keg. Is the 6.5gal carboy to big for a 4gal batch?
The yeast would eat the oxygen up very quickly. I use a 6.5 and it works out fine for my 4 gallon batches.
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Old 02-09-2012, 09:30 PM   #3
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Is the 6.5gal carboy to big for a 4gal batch?
Are you using it for a primary or secondary? It's not too big for the primary fermentation, but I would not use it as a secondary even purged.
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Old 02-09-2012, 09:34 PM   #4
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The last Munich Dunkel I made was in the 6.5gal for primary for about 25days and then in a 5gal carboy for secondary for another 40 days.

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Old 02-09-2012, 09:34 PM   #5
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Head space does not matter in the primary... however, that much head space in the secondary can cause oxygenation and a cardboard flavor.

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Old 02-09-2012, 10:23 PM   #6
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when transferring into your keg post fermentation do you immediately put a bit of CO2 on it and pull the bleeder on top to push out all the O2? I'm always diligent to take a filled keg over to my CO2 setup and put about 30 to 35 psi on it right away to set the seals then bleed off some of the excess pressure to ensure there is nothing but CO2 left in the keg.

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