does potassium sorbate stop primary fermentation
So, many winemakers assume Potassium Sorbate can stop an active fermentation as well. But, nothing could be further from the truth.Potassium Sorbate does not kill the yeast at all, but rather it makes the wine yeast sterile. In other words, it impairs the wine yeast's ability to reproduce itself.nd what the above tells us is that stopping a wine's fermentation in mid-stream when it is at the sweetness you like is not the answer for the average home wine maker. The most successful way for a home wine maker to have a sweet wine is to let it finish fermenting completely to where it is dry.