Based on our award winning Evapo-Rust rust removing technology, Thermocure - Cooling System Flush allows the user to easily and quickly remove rust from automotive and marine engines, mechanical cooling and recirculating systems, and liquid delivery lines without the need for dismantling. Thermocure - Cooling System Flush uses the latest technology in rust and corrosion removal to totally revitalize automotive cooling systems. Thermocure - Cooling System Flush removes rust scale, lime (calcium), and other deposits readily built up in radiators, water pumps, water jackets, engine blocks and heads. Thermocure - CSF is non-acidic and will not harm soldered joints, gaskets or seals. Rust and corrosion in cooling systems acts like an insulator and causes vehicles to overheat. This product restores the engines ability to transfer heat to the coolant allowing the engine to run cooler. 1 litre of Thermocure concentrate will treat cooling systems with a capacity of up to 10 litres. For engines with a capacity of 11-20 litres use two bottles.