Safale K-97 German Ale Yeast

Safale K-97 German Ale Yeast German ale brewer’s yeast producing subtle fermentation character, clean and crisp. Forms a large firm foam head and presents a very good ability to stay in suspension during fermentation. Ideal for delicate beers, traditional German styles, and heavily hopped beers. Technical data sheet available here Top fermenting 11.5g sachet Alcohol Tolerance: 9 - 11% Apparent Attenuation: 80 - 84% Sedimentation: slow Temperature: 18 - 26°C Total Esters: Medium Beer styles: German Kölsch, Altbier, Belgian Wits, and heavily hopped beers Pro-Tips for Brewing with K-97 Massive Krausen: K-97 is famous for forming a very large, firm head (krausen) during active fermentation. Make sure your fermenter has plenty of headspace or use a blow-off tube to prevent messy overflows. Biotransformation Powerhouse: According to Fermentis, K-97 offers the highest potential for hop biotransformation in their entire dry yeast lineup. It unlocks aromatic bound esters in hop oils, enhancing juicy and fruit-forward notes when dry-hopping. Managing Haze: Because its sedimentation is quite slow, your beer may remain cloudy or yeasty-tasting for a long period after fermentation concludes. If you are using it for a clean style like a Kölsch rather than a hazy beer, you will likely need to use fining agents (like gelatin) or subject the beer to extended cold conditioning (cold crashing) to get it bright.