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Old 07-04-2013, 05:50 AM   #1
Carlscan26
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So I just cold crashed for the first time. 3 days at 36 degrees. When I went to keg it (an all columbus IPA) this evening I noticed that my blow off jar was running low. Now I can't say I remember how much was in it when I cranked down the temps - it's been in there a total of 25 days so some evaporation is normal.

Then I remembered these threads about the sanitizer in air locks being sucked in when you cold crash. Did the same happen to me here?

Here's how my setup looks. You can see the blow off jar is on the shelf behind the carboy:


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Old 07-04-2013, 05:55 AM   #2
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I should also mention that the top 1.5" or so of the beer looked much clearer than the beer below it. I tried as hard as I could to not siphon that into the keg. All in all I estimate I pulled just over 4 gals out. I lose about a half to trub and the level was just above the 5gal mark but I didn't think to check it against this picture so I don't know if it was in fact higher or not.


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Old 07-04-2013, 06:00 AM   #3
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Yup, sounds like a case of suck back.
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Old 07-04-2013, 06:02 AM   #4
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Quote:
Originally Posted by igotsand
Yup, sounds like a case of suck back.
Crud!

Any chance I can still drink what I siphoned out as I stayed below the clearer level?

Also, how do I prevent this? I thought using an airlock would always have suck back...I didn't think it would happen with a blow off but admittedly I didn't think about it much. Until now.
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Old 07-04-2013, 06:08 AM   #5
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Quote:
Originally Posted by Carlscan26

Crud!

Any chance I can still drink what I siphoned out as I stayed below the clearer level?

Also, how do I prevent this? I thought using an airlock would always have suck back...I didn't think it would happen with a blow off but admittedly I didn't think about it much. Until now.
You can prevent it by using a bung cap(?), or whatever its called...
It's happened to me before and I still drank the beer(the suck back was starsan)..you won't die from it, it will make your beer watery tho...
What was in your blowoff bucket?
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Old 07-04-2013, 06:11 AM   #6
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Quote:
Originally Posted by igotsand

You can prevent it by using a bung cap(?), or whatever its called...
It's happened to me before and I still drank the beer(the suck back was starsan)..you won't die from it, it will make your beer watery tho...
What was in your blowoff bucket?
Thanks! It was Starsan. I just drank my measurement sample and compared to a sample off the bottom of the carboy after kegging. The dregs are watered down at best. The sample I pulled seemed decent.

I'll look into getting a bung cap thing then before I try this again.
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Old 07-04-2013, 06:13 AM   #7
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Yeah, the lessons we learn..betcha you won't do that again!
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Old 07-04-2013, 06:17 AM   #8
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Quote:
Originally Posted by igotsand
Yeah, the lessons we learn..betcha you won't do that again!
Not this mistake anyway.
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Old 07-04-2013, 10:19 AM   #9
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I like to use my better bottles when I cold crash because I have the "dry taps". They are a positive pressure only, waterless air lock. No suck back ever. They cost an arm and a leg but they are worth it.
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Old 07-04-2013, 10:26 AM   #10
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+1 for the thread title.


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