Abstract: A mobile concentration system (MCS) for milk comprising: a vehicle having a holding tank for receiving and holding milk; and a concentration system mounted to the vehicle and coupled in fluid communication with the holding tank. The concentration system adapted to remove milk from the holding tank and process the milk while the vehicle is stationary and/or uploading or unloading of milk, or underway. The concentration system including a reverse osmosis filtration system adapted receive the milk from the holding tank and process the milk to generate a stream of substantially water and a product stream of concentrated milk. A feed section comprises product/water/CIP (clean in place) valving systems, high pressure pumping equipment operating to receive and pressurize the milk through-out the system. A concentration level control system includes a control valve regulating the concentrate flow to achieve a fixed system operating pressure to control the system.