Chemistry — Water Treatment Chemistry
Coagulation and chlorination of drinking water.
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\text{coagulants: } \text{Al}^{3+},\ \text{Fe}^{3+}
\text{Cl}_2 + \text{H}_2\text{O} \rightarrow \text{HOCl} + \text{HCl}
\text{HOCl} \text{ disinfects}
\text{flocculation settles fine particles}