The unit is divided into two sections: in the upper vertical tub the mixture is pasteurised. In the lower  horizontal tub the mixture is whisked and frozen. The transfer of the boiling mixture from the upper tub to the lower tub takes place inside the machine through a patented system. The product is never exposed to outside contact . While the whisking and freezing process takes place it is possible to start a new production cycle, mixing and pasteurising a new batch.