10-minute radiator flushing. It quickly removes dirt, rust and scale from the system. The vessel is designed for cooling systems up to 9 liters. It is recommended for use before each anti-freeze replacement. It is acid-free. Application: Drain the fluid from the cold radiator. Pour the flushing fluid and top up the radiator with water. Start the engine and let it run for 10 minutes, then stop it and drain water. It is better to flush the system with water to get better results. Add a new coolant.