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Old 02-21-2013, 03:23 AM   #1
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Default OK to plug carboy when crash cooling?

I am looking to start crash-cooling my beers and possibly adding gelatin if needed in order to start getting better clarity. I was thinking of just taking out the air lock and drilled stopper, and replacing with a sanitized non-drilled rubber stopper. Has anyone done this? It seems appropriate since no gas will be going out, but will instead be sucking in. I am just concerned that the internal suction could cause the carboy to possibly "implode" if it gets strong enough. If anyone with experience has any insight, it would be greatly appreciated!


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Old 02-21-2013, 12:57 PM   #2
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The carboy isn't likely to implode but it might suck the stopper into it. Have you thought about how to remove a solid stopper from inside a carboy?

Put on a stopper with an airlock. If you don't put a lot of liquid in the airlock it won't be sucked back into the carboy and if you use a sanitizer like Starsan in it the suckback won't be harmful to your beer even if you do get a little.


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Old 02-21-2013, 01:23 PM   #3
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The stopper is the same stopper as the one that holds the airlock, it is just not drilled. So technically if this could suck into the carboy, so would the airlock. I think I will just give this a try and see how it works out. Te idea of any liquid suckback really bothers me.
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Old 02-21-2013, 01:53 PM   #4
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Originally Posted by Bisco_Ben View Post
The stopper is the same stopper as the one that holds the airlock, it is just not drilled. So technically if this could suck into the carboy, so would the airlock. I think I will just give this a try and see how it works out. Te idea of any liquid suckback really bothers me.
Bad idea, the non-drilled stopper WILL get sucked back into the fermenter.

The reason the drilled one with the airlock doesn't is because the airlock allows two-way exchange of air; yes, air CAN go in to the carboy through the airlock (sometimes sucking liquid back in, in the process).

Just use a small amount of Starsan +water solution with an airlock. It'll be fine. I do this all the time.

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Old 02-21-2013, 01:57 PM   #5
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This is what you need. Best of both worlds!

http://www.keystonehomebrew.com/shop...g-carboys.html
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Old 02-21-2013, 01:58 PM   #6
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Use an air lock with vodka in it.
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Old 02-21-2013, 03:36 PM   #7
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Use an S type airlock.
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Old 02-21-2013, 06:51 PM   #8
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Use an S type airlock.
This, with just enough water to cover the bottom bend.
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Old 02-21-2013, 07:12 PM   #9
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Has anyone ever actually had a rubber stopper suck into the carboy? I just refuse to believe that this is possible. I couldnt squeeze it through the neck of a carboy if I tried as hard as I could. Has this actually happened to someone or is this another homebrewing myth?
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Old 02-21-2013, 07:21 PM   #10
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Either way, I am going to run a few tests to see which works the best between the plug, 3pc airlock and S-airlock. I will post my results for anyone who is interested.


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