DCL has isolated their yeasts from a famous commercial brewery in Switzerland. Safale s-04 is a well known English Ale strain that exhibits fast fermentation with unique sedimentation properties that helps improve beer clarity. In the recommended temperature range of 68-74 deg F., the Safale S-04 will attenuate the wort down to 1.008 to 1.012 within 2-3 days. The ideal yeast to produce the best ales! 11.5 g package.