Managnese is not dangerous ...

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Managnese is not dangerous for health but must be removed because it gives a dark color and steel smell to the water.

To remove manganese you need to make an oxidation from Mn+2 to Mn+4 and the precipitation will be MnO2 and you can remove this with sand filters.

Oxidation with oxygen some time is not sufficient and you can add chemical reagents like : ClO2, Cl2, KMnO4 or O2.

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