As a primary answer you can ...

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As a primary answer you can easily remove Iron and Manganese using 20-50 ppm free chlorine and NaOH to achieve a pH 8-9 for oxidation following a sedimentation/oxidation tank for at least 1 hour residential time. Water should be then filtered by sand/pyrolusite media at a linear speed of 10 m/h. 

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Oxidation followed by filtration is the cheapest way. If the flow is low, aeration followed by a good settling time and then filtration may solve the problem without chlorination. Oxidizer dosage can be calculated using Plutocalc.

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