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Old 12-12-2005, 09:58 PM   #1
AllHoppedUp
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Default carboy . . .

I posted this question on another forum and haven't yet got much response. Does anybody regualarly use a 6.5 gal carboy as a secondary fermenter? Anything positive or negative to say about? My concern is possible oxidation caused by excess space in carboy above the 5 gallons of beer. I've read on other posts, however, that the CO2 produced by the beer will displace the oxygen and push it out through the airlock.

The reason I ask is I need another carboy and if using it for a secondary isn't an issue I thought that a 6.5 gal could be used as sort of a dual-purpose carboy. A primary when I need another primary (with blow off hose) and a secondary when I need another secondary. What do you think?

AHU

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Old 12-12-2005, 10:21 PM   #2
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I don't see any issues with a 6.5g carboy as a secondary. I've used 6.5g plastic buckets when I needed to add large ingredients in a hop bag to the secondary and the airlock will usually rise eventually. It would seem to me that as long as you're not disturbing the fermenter it really only needs a bit of CO2 above it to insulate it from oxygen.

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Old 12-12-2005, 11:31 PM   #3
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or you could just scale up your recipe's Canadian style.

I used to use 6.5 gallon (US) carboys to make 5 gallon (Canadian) of beer, till the dang thing went missing when I moved.

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Old 12-13-2005, 01:35 AM   #4
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i have never had a problem with using a 6.5 gallon carboy for primary or secondary. i have a 5 and a 6.5 as well as two 6.5 plastic fermentors

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Old 12-13-2005, 02:03 AM   #5
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Never had a problem. The air is displaced by/with CO2.

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Old 12-13-2005, 03:35 AM   #6
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Agree with other posts. I usually use a 6.5G for primary because I am too lazy to clean up the blow off and also hate to see all the foam go to waste. ! I typically use a 5G for secondary. Have and do use 6.5's for secondary...no issues.

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Old 12-13-2005, 04:31 AM   #7
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I use both 5 and 6.5, and here lately I been using my 8 gallon plastic conical as secondary, cause its easier to bottle or keg from.

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Old 12-13-2005, 04:45 AM   #8
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6.5 or 5 gallon, either way, no problem to use!

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Old 12-13-2005, 04:48 AM   #9
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Only a pain in the arse to clean....until now...UPS just delivered my new Battery or electric drill operated Turbo Scrubber. WOOHOO......Suggests 1700 RPM to clean inside dried krausen.

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Old 12-13-2005, 03:23 PM   #10
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I use three 6.5 glass carboys as primaries. I love them because I never have a blow-off. I use a blow-off hose anyway, but it never gets that high.
I do use smaller ones for secondaries, but mainly because they're cheaper.

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