The white power or sediment is minerals crystal from the water. It is a natural substance and harmless to the human body.
Cleaning process:
1. Put citric acid in the inner bottle
2. Add clean water to the maximum water level mark, and mix citric acid and water well
3. Press the "Select" button for 3 seconds, the thermo pot will start cleaning
4. After cleaning, unplug the plug and remove the lid, and drain away the hot water
5. Refill with water and boil it to remove the smell of citric acid
6. After draining the water, reuse the thermo pot to boil drinking water