A transmission system includes: a transmission management system and a fee management system. It is possible by this method to obtain the lithium tetrafluoroborate solution whose acidic impurity content and water content are reduced to be 50 mass ppm or lower and 15 mass ppm or lower, respectively. The function of the outlet valve is furthermore improved by the provision of an actuating lever, which comprises two hinged parts and which for high-viscosity substances, particularly in the frozen state, reduces the actuating force to a practicable level.