From the cooker, the mash heads to the fermenter where it is cooled to 60–70 °F and yeast is added again. The yeast is fed by the sugars in the mash, producing heat, carbon dioxide and alcohol. Called "distiller's beer" or "wash", the resulting liquid (after filtering to remove solids) looks, smells and tastes like (and essentially is) a form of beer. The wash is pumped into a column still where it is heated to over 200 °F, causing the alcohol to turn to a vapor. As the vapor cools and falls it turns to a liquid called "low wine", which measures 125 proof or 62.5% alcohol. A second distillation in a pot still heats and condenses the liquid into "high wine", which reaches 135 proof (67.5% alcohol).