The most common mistake is treating iron with a softener. Resin coats with iron oxide within weeks; the unit then needs replacement rather than regeneration.
- Look at iron, manganese, hardness, TDS and turbidity first — those five decide 90% of the configuration.
- Aeration + sand filtration for iron; catalytic media when manganese is also present.
- If TDS is high as well, the filtration stage becomes pre-treatment for RO rather than a stand-alone solution.
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