A cooling system for cooling a flow of milk comprising - a first refrigeration system and a second refrigeration system having individually controllable cooling powers; - a first intermediate coolant circulating system and a second intermediate coolant circulating system; and - a line manifold interconnectable between the first and second intermediate coolant circulating systems, wherein - coolant in the first intermediate coolant circulating system is in heat exchange connection with the first refrigeration system in a first heat exchange section and coolant in the second intermediate coolant circulating system is in heat exchange connection with the second refrigeration system in a second heat exchange section; and - the cooling system is reconfigurable between (i) a first operation configuration wherein coolant in the first intermediate coolant circulating system is in heat exchange connection with a flow of milk to be cooled in a third heat exchange section and coolant in the second intermediate coolant circulating system is in heat exchange connection with the flow of milk to be cooled in a fourth heat exchange section arranged downstream of the third heat exchange section with respect to the milk flow, thereby providing two-stage cooling of the flow of milk, and (ii) a second operation configuration wherein the line manifold is interconnected between the first and second intermediate coolant circulating systems to mix coolant of the first intermediate coolant circulating system with coolant of the second intermediate coolant circulating system, such that the mixed coolants of the first and second intermediate coolant circulating systems are in heat exchange connection with the milk to be cooled in the third and fourth heat exchange section or only in the fourth heat exchange section, thereby providing one-stage cooling of the flow of milk. - a first refrigeration system and a second refrigeration system having individually controllable cooling powers; - a first intermediate coolant circulating system and a second intermediate coolant circulating system; and - a line manifold interconnectable between the first and second intermediate coolant circulating systems, wherein - coolant in the first intermediate coolant circulating system is in heat exchange connection with the first refrigeration system in a first heat exchange section and coolant in the second intermediate coolant circulating system is in heat exchange connection with the second refrigeration system in a second heat exchange section; and - the cooling system is reconfigurable between (i) a first operation configuration wherein coolant in the first intermediate coolant circulating system is in heat exchange connection with a flow of milk to be cooled in a third heat exchange section and coolant in the second intermediate coolant circulating system is in heat exchange connection with the flow of milk to be cooled in a fourth heat exchange section arranged downstream of the third heat exchange section with respect to the milk flow, thereby providing two-stage cooling of the flow of milk, and (ii) a second operation configuration wherein the line manifold is interconnected between the first and second intermediate coolant circulating systems to mix coolant of the first intermediate coolant circulating system with coolant of the second intermediate coolant circulating system, such that the mixed coolants of the first and second intermediate coolant circulating systems are in heat exchange connection with the milk to be cooled in the third and fourth heat exchange section or only in the fourth heat exchange section, thereby providing one-stage cooling of the flow of milk. (i) a first operation configuration wherein coolant in the first intermediate coolant circulating system is in heat exchange connection with a flow of milk to be cooled in a third heat exchange section and coolant in the second intermediate coolant circulating system is in heat exchange connection with the flow of milk to be cooled in a fourth heat exchange section arranged downstream of the third heat exchange section with respect to the milk flow, thereby providing two-stage cooling of the flow of milk, and (ii) a second operation configuration wherein the line manifold is interconnected between the first and second intermediate coolant circulating systems to mix coolant of the first intermediate coolant circulating system with coolant of the second intermediate coolant circulating system, such that the mixed coolants of the first and second intermediate coolant circulating systems are in heat exchange connection with the milk to be cooled in the third and fourth heat exchange section or only in the fourth heat exchange section, thereby providing one-stage cooling of the flow of milk.