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In page Single malt whisky:

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Yeast is added to the wort in a large vessel (often tens of thousands of litres[citation needed]) called a washback. Washbacks are commonly made of Oregon pine or stainless steel.[citation needed] The yeast feeds on the sugars, and as a by-product, produces both carbon dioxide and alcohol. This process is called fermentation and can take up to three days to complete. When complete, the liquid has an alcohol content of 5 to 7% by volume and is now known as wash. Up until this point the process has been quite similar to the production of beer.