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Loss of carbonation


So I recently moved from Pennsylvania to Virginia.

I brought several cases of homebrew with me, and all of them seem to have lost some carbonation in the move. A beer that I had to open over the sink now barely has any head at all.

Any reason why this might have happened? I figured it might have been elevation, but I checked and the difference is negligible - about 30 feet difference. I’m at a loss.