Yep it can happen. I got 2.5 gallon mix frozen in a bucket from leaving it in the garage. Lame
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What's the pH when you thaw it out?
I can't be arsed to keep up this list of what's in the fermenters, but hey, check out the cool brewery I own!
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I cannot say for sure because my PH strips read 4.6 - 6.2, however the color indicated to me it was much less 4.6.