1. Turn off the power to the water heater to prevent water and electricity leaks.
2. Use a wrench to unscrew the cold water hose and release the water in it.
3. After unscrewing the cold water pipe, the scale in the water storage tank will be discharged.
4. Connect the cold water pipe to the outlet of the hot water pipe, open the cold water pipe and cold water will flow out of the hot water pipe.
5. Start flushing the water tank and remove remaining scale until the water is clean. If the water heater has a waste water outlet, opening the waste water outlet can clean it more cleanly.