A system and method for the monitoring and treating of a coolant in a cooling system of an MRI system includes a deionization kit connectable to the cooling system of the MRI system. The deionization kit receives coolant from the cooling system to deionize the coolant and forms a closed-loop system with the cooling system when connected thereto. The deionization kit thus allows for unimpeded circulation of the coolant through the deionization kit and the cooling system. Accordingly, the MRI system may remain in operation and be used to perform MR image acquisitions of an object while the deionization kit is connected to the cooling system.