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Home Brew Forums > Home Brewing Beer > General Techniques > 5 or 6 1/2 gallon for fermenting?
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Old 12-29-2007, 07:19 PM   #1
hagen505
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Default 5 or 6 1/2 gallon for fermenting?

For fermenting which is better? the 5 gallon which will blow off more of the hop resins and exess yeast during the start of fermentation? or the 6 1/2 gallon which will leave more in the carboy? or does it matter? I am just getting back into beer brewing after a long break, but have accumulated a bunch of 6 1/2's from wine making. thanks...


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Old 12-29-2007, 07:26 PM   #2
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Quote:
Originally Posted by hagen505
For fermenting which is better? the 5 gallon which will blow off more of the hop resins and exess yeast during the start of fermentation? or the 6 1/2 gallon which will leave more in the carboy? or does it matter? I am just getting back into beer brewing after a long break, but have accumulated a bunch of 6 1/2's from wine making. thanks...

I would personally use the 6.5 as my primary because it is good to have the krausen, it protects the beer, versus blowing everything off with a 5 gallon fermenter. I would then use a 5 gallon as my secondary because it leaves less airspace during clearing and would allow you to get rid of the excess resins and trub you speak of.

But thats my preference, try it if you like.


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Old 12-29-2007, 07:28 PM   #3
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I brew 5.25-5.5 gals so the carboy is definitely out.

The 6.5 for a primary and 5 gal for the secondary.
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Old 12-30-2007, 01:44 AM   #4
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As a rule of thumb you want your fermenter to be at least 25% bigger than the wort size to allow for the krausen. Your 6.5's are ideal for 5 gallon batches.

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Old 12-30-2007, 02:29 AM   #5
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Thanks, I wasn't sure if it was beneficial to get rid of the initial krausen or trub. I thought that it may contribute to off flavors or hangover contributing resins. Is it still neccesary to use a blowoff hose when using the 6.5? or will the airlock suffice?

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Old 12-30-2007, 04:45 PM   #6
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It depends on the brew. The majority of batches I've done did not need a blowoff tube for the 6 1/2. Of course, a few others have *Definately* needed a blowoff.
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Old 12-30-2007, 05:56 PM   #7
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Quote:
Originally Posted by Jamo99
It depends on the brew. The majority of batches I've done did not need a blowoff tube for the 6 1/2. Of course, a few others have *Definately* needed a blowoff.

My porter about 14hrs after pitching. 5.5gal in a 6.5 gal carboy.



I'm trying the plastic wrap and rubber band since I don't have a blowoff hose.


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Old 12-30-2007, 06:01 PM   #8
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Quote:
Originally Posted by hagen505
Thanks, I wasn't sure if it was beneficial to get rid of the initial krausen or trub. I thought that it may contribute to off flavors or hangover contributing resins. Is it still neccesary to use a blowoff hose when using the 6.5? or will the airlock suffice?

You won't get any off flavors from the krausen unless you leave the beer in primary for 2 or 3 months. The "hangover contributing resins" you are talking about are the fusel alcohols that result from fermenting at too high a temperature, not from anything in the krausen. The krausen contains a lot of yeast that will help in getting your beer down to your target final gravity, so you don't want to skim it off.

Blow off tubes are needed now and then even with the 6.5 gallon fermenter, especially with 1.065+ beers and many wheat beers.

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Old 12-30-2007, 06:37 PM   #9
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Primary 6.5 it keeps from having a blowoff, 5.0 for secondary. less room for o2
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Old 12-31-2007, 01:38 AM   #10
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There isn't going to be any O2 anyway. The yeast will blow all of the oxygen out of the carboy regardless of 6.5 or 5 gallon. Co2 will form a layer on top of the beer as soon as the yeast begin.



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