Pot Distillers Yeast 18% can ferment fruit brandy, fruit schnapps, grappa, brandy and other mashes to 18% which greatly improves taste after distillation, and gives a better yield. It's a hit with all schnapps distillers. Also, it can sometimes be used to ferment larger batches to 18% alcohol by using one sachet to 50 liters of sugar or fruit mash (half dosage). This is normally impossible with high alcohol Turbos: they ferment violently and produce so much heat early in the process that the yeast dies.