Milk is first received in a dump tank from the milk tankers. Milk is usually stored in the tank farm area at approximately 39 degrees Fahrenheit, or colder, for no more than 48 hours. Vats and silos in the tank farm are constantly agitated to make sure that the entire volume remains cold and that the milkfat does not separate from the milk. Whole milk, once approved for use, is pumped into storage silos where it undergoes pasteurization, homogenization, separation and further processing.