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Dry ice to keep cooler cold

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Nimrod3388

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I was thinking of using a small cube of dry ice instead of frozen 2 liter bottles in my cooler (5 gal carboy). I know the ice will need to be insulated and not in contact with the glass for it probably will crack. I figure if I can determine the best size it should keep the brew cool. Has anyone done this before or is this a big risk?
 

Philip1993

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If you keep it trapped underwater, it will develop a layer of ice on the outside that will slow the sublimation a whole lot.
 
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