The liquid may not have all evaporated but after a year, how much SO2 is actually left?I use water and sulfite in my airlocks and most will last a year without evaporation.
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Its an Airlock to keep air out more than anything. We use sulfite solution because its on hand and available. The level of SO2 in the airlock is irrelevant. As long as the wine itself has the proper amount of SO2 it doesn't matter whats in the airlock. You could put tap water in and your wine would not magically turn bad and start growing mold.
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