Is chlorine dosing really required for iron and manganese removal?

Application: Sodium hypochlorite / liquid chlorine as oxidant; filter media are manganese‑dioxide‑coated zeolite‑based catalytic media, applied for removal of ferrous iron, manganous manganese and hydrogen sulphide (H₂S) from groundwater.

Important Premise: Katalox‑Light and ZIMR can operate without chemical dosing. Chlorine addition is not mandatory. Pre‑oxidation with chlorine (sodium hypochlorite) is only required under specific raw‑water conditions. The free residual chlorine at the inlet of filter vessel must be kept below 0.5 mg/L. Excessive residual chlorine will damage the catalytic layer and accelerate aging and failure of filter media.

1. When to dose chlorine (sodium hypochlorite)

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