Water used (produced) in power plants is roughly divided into the following categories:
1. “Raw water” extracted from rivers and lakes cannot be used without treatment. (Mainly used for circulation cooling)
2. The raw water is precipitated and filtered to become "domestic fire water", which is equivalent to "tap water" and can be used for bathing.
3. Domestic firefighting water is then treated with chemicals to become “industrial water” and should not be used. (Used for equipment cooling)
4. It will then be transformed into “demineralized water” and cannot be used. (for boiler fluid)