Four thousand milliliters. Both tea bar machines and water dispensers can use conventional clean drinking buckets on the market, such as 4000ml mineral water from general supermarkets or 18.9L drinking buckets ordered by the company. The size of the bucket used in the tea bar machine is not fixed, mainly depending on the size of the venue and the scale of business. So some people use 5-liter barrels, some use 7.5-liter barrels, and some use 1 1 liter barrels. Buy according to personal needs.