Fermentation is a very old process that has been around for centuries. Even though there are different fermenting methods for different foods, most of the time, you just have to make sure that your vegetables or fruits stay under the brine. However, unless you are experienced with fermenting, there will be many situations where you do not know what to do.
Within the fermentation process, carbon dioxide gets released as a by-product. Because of this, after a few days, you will notice at least one change in your fermentation jar. Vegetables or fruits rising up, brine overflowing, and the brine level going down are some common happenings. Al of this occurs because of the release of carbon dioxide. When the gas is released, it will form small bubbles that can push your fermenting food up. This is quite natural and all you have to do is to release some of the gas in the jar or press down on the food with a clean wooden spoon or a clean hand. It is important to keep the vegetables under the brine level at all times for the fermenting to properly happen.