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Home Brew Forums > Home Brewing Beer > General Techniques > Crash cool...How and why and where and who?
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Old 12-01-2008, 06:01 PM   #1
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Default Crash cool...How and why and where and who?

i have searched for "crash cooling" can anyone just breifly explain the how to of this. I assume you do it to stop yeast fermentation and possibly to drop the yeast to the bottom of your fermenter quicker???

Thanks
I appreciate any help

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Old 12-01-2008, 06:05 PM   #2
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HOW= GET IT COLD! like in the fridgerator....the colder the better.
Why = Drop the crap that's in suspention!
Where = ANY place that will fit your fermenter and is below say....45F?
Who = Anyone that wants to clear their beer, mead, wine or cider.

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Old 12-01-2008, 06:05 PM   #3
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Crash-cooling will help the yeast flocullate and fall out of suspension faster. Combined with a fining agent like gelatin or isinglass, it can dramatically clear the beer. Crash-cool after fermentation is finished and you've let the beer sit on the yeast for several weeks. I crash-cool in my keezer if I have the room, usually around 37-39 degrees for a minimum of 3 days, but usually it goes weeks if I rack to the keg and cold-condition.

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Old 12-01-2008, 06:06 PM   #4
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Well, no. It doesn't work to halt fermentation. Fermentation would just start up again when it warmed up. It works to help clear the beer by dropping out particles that can cause chill haze, as well as other proteins and some yeast that cause cloudy beer.

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Old 12-01-2008, 06:10 PM   #5
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Originally Posted by YooperBrew View Post
Well, no. It doesn't work to halt fermentation.
I have heard of people indicating that they are going to try and stop fermentation...in a cider...by crash cooling when the desired sweetness level is reached. That scares the hell out of me! I'm in 100% agreement with Yooper. Crash Cooling is NOT a reliable means to stop fermentation.
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Old 12-01-2008, 06:17 PM   #6
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so i could just keg it, then let it "crash cool" for a few days then hook up the co2??
thanks

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Old 12-01-2008, 06:23 PM   #7
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so i could just keg it, then let it "crash cool" for a few days then hook up the co2??
thanks
Sure, you could do that. That will work. Crash cooling it means cooling it fast (like in a fridge) so that the floaties are encouraged to fall out.
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Old 12-01-2008, 06:27 PM   #8
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I typically crash cool in primary and then rack to the keg to get the clearest beer. Crash cooling is also a great time to add gelatin if you decide to go that route.

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Old 12-01-2008, 09:15 PM   #9
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so i could just keg it, then let it "crash cool" for a few days then hook up the co2??
thanks
like Yoop said, you could do that. BUT I would crash cool n the fermenter, THEN trasnfer. This leaves all the sediment behind. Leaving no chance for it to get stirred up while drawing pints.
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Old 12-01-2008, 09:44 PM   #10
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yeah, if i had room in the kegerator for my primaries (without removing both kegs!) i'd definitely crash cool in the primary. the more you leave behind the better.

given what i'm working with though, i just let the beers clear on their own in the primary (for normal gravity non-belgians that takes about three weeks) then keg them and keep them cold for a week at least. i hook them up to the gas at the beginning of the week so that they're pretty well carbed by the end. if you do this you don't want to use the "shake the keg" carbing method, as it'll mix up all that stuff you crashed out.

after a week in the cold the first pint usually has some sediment (though not enough to make it unappealing to my tastes) and then it's crystal clear beer til the last pint, which gets cloudy again.

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