Diammonium Phosphate is a yeast nutrient that acts as a good source of nitrogen and also aids in the reduction of sulfur. It works best if used early in fermentation. This nutrient is highly recommended to supplement the use of Champagne yeast in order to minimize potential geranium type odors and flavors. Recommended dose is 1 tsp. per gallon mixed and added during pretreatment of must or at the time of yeast pitch.