Anti-foam Agent Powder is a powdered, food-grade silicone used to reduce excessive foaming during fermentation. You add up to one gram of the Anti-Foam powder per gallon of beer or wine prior to fermentation to prevent foam from pushing up and clogging your airlock. Great to use with turbo yeast or super yeast. The Anti-Foam will not affect the finished flavor, appearance or head retention of your beverage. Contains 5 grams, which is enough to treat 5 gallons.