Anti-Foam is a unique emulsion of dimethylpolysiloxane. It is an extremely effective, surface active agent that prevents foam formation during fermentation by reducing surface tension. Reduced foaming increases fermentation capacity and prevents mess, improves alpha-acid utilization and CO2 recovery, and prevents hazes due to collapsed foam. Used during the boil it can help to break up and prevent messy boilovers. Does not remain in the finished beer.