Do not use pure product. Mix with soft water according to the required freezing protection: refer to chart To maintain anti-corrosion properties, do not dilute below 33%.Water for dilution: If possible, use soft water: Maximum hardness 35Degrees F and chlorides and sulfates maximum contain 50 ppm.Drain intervals: Refer to the manufacturers' recommendation. Attention, control or drain the coolant only when the engine is cold. This product should not be used to protect drinking water systems against freezing. Dangerous. Respect the use and handling recommendations.