When you're flushing a cooling system you should use an approved acid and what?

When flushing a cooling system, you should use an approved acid along with clean water to ensure thorough removal of contaminants and scale buildup. It's crucial to follow manufacturer guidelines and safety precautions to avoid damage to components. Additionally, using a flushing agent specifically designed for cooling systems can enhance the cleaning process. Always ensure the system is properly rinsed after the flush to prevent any residual chemicals from causing corrosion.