Milk is refrigerated to maintain its quality for as long as possible, and to reduce the growth of bacteria. You can achieve more cost-efficiency in on-farm milk cooling if the milk is pre-cooled using well water through a heat exchanger – before it enters the milk tank for cooling by refrigeration. Both these cooling stages must work efficiently to maintain maximum milk quality. Making sure you have the correct water-to-milk flow rate to pre-cool the milk before it enters the bulk tank will optimise pre-cooling efficiency. We recommend 2.5:1 or 2:1 water-to-milk flow rate.