wild-fermented-beet-kvass(3) I am an affiliate for Amazon Services LLC Associates Program. Make a purchase through the links I share, and I’ll get a small commission, without it costing you extra. Thank you for your support! November 18, 2021 by Autumn Leave a Comment As you let your wild fermented beet kvass sit, bubbles and a white powder may appear on the surface. This should be skimmed off to avoid mold growth.