1. The grapes do not need to be washed too much, because the yeast required for fermentation comes from the wild yeast on the grape skin. Excessive washing will greatly reduce the amount of yeast, which is not conducive to fermentation.
2. In the early stage of fermentation, do not seal the lid tightly, because this is the time when the yeast reproduces and needs oxygen;
3. When the fermentation is vigorous, the lid needs to be opened, because the fermentation process produces gas, and the sealing is too tight, which will break the container, so cover it with a few layers of sparse cloth.
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