A stuck fermentation is when the yeast stop fermenting early, leaving the final gravity reached considerably above the expected final gravity. Can be caused by temperature swings, poor yeast condition or using a strain with insufficient alcohol tolerance.

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Stuck second fermentation - suphites to blame?

I'm making a sparkling elderflower wine. It's in a 25l plastic bucket with a trap. The first fermentation went well. I racked it, added sulphites (Campden tabs), added fining, left for a couple of ...