RMI-25 Cooling System Treatment RMI-25 Cooling System Treatment is a very low-cost, extremely effective defense against cooling system failure in all engines. It is a total 'pour in/drive-away' method which removes rust, scale and corrosion, prolongs component life, increases water filter longevity, and has no disposal costs when used with water only. Significantly reduce water pump, radiator, and cooling system failures! RMI-25 is so very easy to use - just pour it in and drive away! Buy Now RMI-25 will safely & effectively clean & lubricate the entire cooling system as the engine operates.