The closed system consists of one or more ballast water tank pairs which are connected with air-pipes on the top and water pipes close to the bottom. The compressed air from the blower unit(s) is used to shift the water between the tank pairs to generate the compensating moment. The direction of the air-flow is controlled by a valve group to the tank and back to the atmosphere via a silencer. The system has extremely short response times in combination with high compensation rates. Blower Heel Control systems can be combined with U-Tank Roll Damping Systems and Ice-Heeling operational modes can be provided as additional option.