Fact 1: Treating water is used to remove harmful substances before drinking.

Fact 2: Hydration is maintained by drinking a lot of fluid.

Given the two facts above, answer the question "What is treating water to remove harmful substances done before?" with the following options: 
- vaporization
 - bacteria
 - evaporation
 - hydration
 - dangerous
 - Frogs
 - Relieve pain
 - a pathogens


 

    hydration     