After adding CO2 to the meads yesterday, the airlock was filled with fresh water and attached to the carboys. The water levels in the two chambers were equal.
Within a short time the meads began to generate a small vacuum shifting the levels of the airlock. This must be an uptake of CO2 in the meads. I thought the meads would be saturated by CO2, but apparently not. This will also push pH down a bit.
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