Nitrite Level range in the cooling system is 1200 - 2000 PPM NO2. The experiment shows that to avoid any corrosion and cavity nitrite level always should be maintained above 1200 PPM. The initial dosage of Cooltreat is 6 ltr for every ton of cooling water can result in this level. Various Experiment also shows that presence of bacterial contamination in water cooling system also lowers the results of Nitrite LEVEL.