As most replied already, it ...

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As most replied already, it depends a lot on your raw water Fe/Mn concentrations and pH. But in general, aeration to oxidize iron, sand filter to remove precipitated iron (a part of Mn will be removed too), then a natural manganese dioxide filter for Mn removal. Then you need to consider treating the solids coming from the backwash of the sand filter, and also from time to time to regenerate or replace the manganese dioxide filter. Chemical-free solution.