Preparation with intuitive anti-corrosion effect for closed cooling circuits. Recommended for corrosion protection of closed cooling water circuits, chilled water systems and engine cooling systems. Preparation based on molybdate nitrite, which perfectly inhibits corrosion. The product also contains a specific inhibitor for copper and copper alloys and can be used to protect aluminum. Apply using the CT-CARD dosing system, to the feed water to maintain the desired level of molybdate in the system.