A bulk tank is used in dairy farming and acts as a bulk cooling tank for holding milk. Bulk tanks hold milk at a cool temperature until it can be picked up by the milk truck. Bulk tanks are made of stainless steel and are a required piece of on-farm equipment to store raw milk. The tank is cleaned after each milking to ensure it is sanitary and kept in good working condition. There are many different sizes and styles to choose from, which will be dependent on the size of the dairy operation. In addition to bulk tanks, it's important to have a cleaning system, with most modern dairy farmers preferring an automatic washing option.