How much iron can an iron filter remove?

Iron filters, like manganese greensand filters, are typically effective for treating water with iron levels up to 10-15 mg/L.

Based on the provided reference, **iron filters** that are commonly used, such as a manganese greensand filter, are an effective treatment method for addressing red-water iron problems when the iron concentration in the water is up to **10-15 mg/L**.

This indicates that these types of filters are designed to handle and significantly reduce iron levels within this specific range. For scenarios where iron levels exceed this threshold (more than 10 mg/L), the reference suggests that alternative or enhanced treatment processes are often necessary. These advanced methods typically involve:

*   Aeration (injecting air into the water)
*   Chemical oxidation (commonly using chlorine in forms like calcium or sodium hypochlorite)

These oxidation steps are usually followed by a filtration process, suggesting that while filtration is key, it needs pre-treatment for higher iron concentrations than standard filters alone can manage effectively.

Therefore, a typical iron filter is best suited for water with iron levels in the 10-15 mg/L range or below.