Fermaid K 2,5 kg gjærnæring - LallemandFermaid K In all fermentations yeast growth must take place before the anaerobic or alcohol fermentation can begin. In most beer applications, the common active dried yeast inoculation (when yeast is added to wort) is 100g hL, twice the amount for lagers, which results in an initial cell concentration of six to ten million viable cells mL of wort. Under normal conditions, the cell population will increase to 100 to 150 million viable yeast cells mL