Control Foam and Prevent Messes During Boil & Fermentation Kerry FermCap® S is an essential brewing aid that helps homebrewers eliminate messy boil-overs and reduce krausen buildup during fermentation. Available in both 15 g and 1 oz vials, FermCap® S works by reducing surface tension to stop foam before it starts—giving you more headspace and a cleaner brewing environment. How to Use FermCap® S in Brewing For the boil, add 1–2 drops per gallon of wort to your kettle before bringing it to a boil. FermCap® S keeps hot break foam under control, preventing wort loss and sticky stove messes. For fermentation, add 2 drops per gallon to your fermenter before pitching yeast to limit krausen height and prevent blow-offs—ideal for high-gravity ales or limited headspace fermenters. Note: Proper pitch rate is especially important in high-ABV beers like barleywines, imperial stouts, and Scotch ales. FermCap® S helps minimize yeast stress from overactive fermentations without affecting yeast health or final beer quality. Why Choose Kerry FermCap® S? Prevents boil-overs: Clean, efficient brew days without losing wort. Minimizes krausen: Helps avoid messy blow-offs and clogged airlocks. Neutral to beer: Has no impact on flavor, aroma, clarity, or yeast performance. Economical: Just a few drops per batch—both vial sizes last multiple brews. Trusted by brewers: A staple anti-foam solution used across all levels of brewing. Choose the Right Size 15 g Vial: Ideal for occasional or small-batch brewers. 1 oz Vial: Perfect for frequent brewers or larger systems needing multiple doses. Stop boil-overs before they start and maintain a cleaner, more efficient fermentation with Kerry FermCap® S. It's the small addition that makes a big difference on brew day!
