Do You Still Need a Fermentation Weight when Fermenting in a Jar with an Airlock? Yes. Let me explain why. Even when using an airlock, you will need a fermentation weight when fermenting sauerkraut so that you can hold your packed mixture below the brine. During the first stage of fermentation – typically, the first 5-7 days – CO2 gases are created by bacteria present in your ferment. These air bubbles get trapped in a tightly packed mixture – like sauerkraut – and cause the mixture to expand and move up and out of the brine. A weight works to hold the expanding ferment under the brine and force the air bubbles to work their way up and out the of mixture where they rise to the surface of the brine and then exit the jar through an airlock.
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