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Old 05-26-2013, 12:55 AM   #1
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Default cold crash airlock suck

How do you cold crash without getting the airlock liquid sucked into the beer? I have only tried cold crashing once and this was an issue.

I have 3 batches I want to cold crash this week and looking for solutions.



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Old 05-26-2013, 02:18 AM   #2
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use a sanitized rubber stopper without a hole in it



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Old 05-26-2013, 02:30 AM   #3
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I mostly ferment in a bucket and leave the lid loosely placed on top when cold crashing. As a matter of fact, I usually leave the lid loosely placed on top throughout the entire fermentation. In a carboy, I would just pull the stopper and wrap a bit of foil over the opening, maybe even use a rubber band to hold it in place. If you worry about infections you can spray the foil with some sanitizer if you like.

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Old 05-26-2013, 11:54 AM   #4
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Dump the liquid out of the airlock, and replace with a cotton ball to act as a filter.

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Old 05-26-2013, 01:28 PM   #5
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Drop the temp in increments. Maybe 10 degrees at a time.

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Old 05-26-2013, 02:24 PM   #6
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Quote:
Originally Posted by stompbox View Post
How do you cold crash without getting the airlock liquid sucked into the beer? I have only tried cold crashing once and this was an issue.

I have 3 batches I want to cold crash this week and looking for solutions.
If using a 3-piece airlock, Use just enough starsan, to float the airlock. By using less liquid in the airlock, there will not be enough starsan, to able to be sucked back, into a fermenter. I do this all the time, when I cold crash.
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Old 05-26-2013, 02:38 PM   #7
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Replace the 3 piece airlock with an S type bubbler during cold crashing.

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Old 05-26-2013, 02:49 PM   #8
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A three piece, filled with just enough (cheap) vodka to float the cup will not suck any back. If it does it's just vodka.

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Originally Posted by seigex View Post
use a sanitized rubber stopper without a hole in it
... don't follow that advice. If you get it sealed well enough to make it matter that you are using a stopper, it will suck into the carboy. Most likely however it will just put enough suction on it to pull air around the edges. At least with an airlock you bubble it through vodka, making a passing attempt at sanitizing.
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Old 05-26-2013, 02:51 PM   #9
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As everyone has said, use S shapes. All I use now for this reason.

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Old 05-26-2013, 03:32 PM   #10
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Quote:
Originally Posted by LBussy View Post
A three piece, filled with just enough (cheap) vodka to float the cup will not suck any back. If it does it's just vodka.



... don't follow that advice. If you get it sealed well enough to make it matter that you are using a stopper, it will suck into the carboy. Most likely however it will just put enough suction on it to pull air around the edges. At least with an airlock you bubble it through vodka, making a passing attempt at sanitizing.
If you use a solid stopper it will seal and create a vacuum within the carboy... if you use vodka or starsan in an airlock, eventually it will suck it all through you will still be sucking air through once it runs out of vodka/starsan to suck through ... not sure why he shouldn't follow my advice, this is what I've been doing for more than 8 years and haven't had an issue.

I'm not the only one with this suggestion:

http://www.homebrewtalk.com/f163/cold-crash-air-lock-sucking-200395/

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Can you pull out the airlock and replace it with a solid bung? The reason it's sucking in is because of the temperature dropping inside the fermenter and pulling a vacuum. If you take out the airlock and replace it with a solid bung (or even some sanitized foil), that will be a quick and easy fix.


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