German ale / Kolsch yeast The perfect dry yeast for your German ales or Belgian-style wheat beers. K-97 is selected for its penchant to form a large, firm krausen while fermenting. A great choice for ales that you want to have a low ester character. The lower attenuation of K-97 makes for beers with a nice mouthfeel. Can ferment anywhere between 54-77°F, although the ideal range is between 59-68°F. This yeast can be pitched directly, but if you prefer to rehydrate, the instructions are below. Sprinkle the yeast in a minimum of 10 times its weight of sterile water or wort (we suggest 4 oz) at 70°F to 77°F (21 to 25 °C). Do not stir. Leave to rest 15 to 30 minutes. Gently stir for 30 minutes, and pitch the resultant cream into the fermentation vessel. Recommended temperature range: 59-68°F.