How to Filter Iron out of Water

Written by clem samuels
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How to Filter Iron out of Water
Iron can be removed from water by filtration. (Michael Blann/Digital Vision/Getty Images)

Aside from water hardness, the presence of iron in water is probably the most common problem faced by consumers and water treatment professionals. While a water softener can be used to remove small amounts of iron, filtration is required in more robust treatments. There are two filtration methods: those using additives such as chlorine, ozone, or air; and those using an oxidising filter media. In these filtration methods, electrons are transferred from the iron to an oxidising agent.

Skill level:

Things you need

  • Ozone
  • Chlorine
  • Aerator
  • Manganese greensand
  • Proprietary granular filter
  • Manganese dioxide ore

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    Filtration Methods Using Additives

  1. 1

    Filter out the iron using an ozone filtration method. To do this, feed ozone into the water stream in order to convert ferrous iron to ferric iron. The ferric iron can then be filtered out using an inert multilayered filter.

  2. 2

    Add chlorine to the water as another option. The treated water can then be held in a retention tank until the iron is filtered out using manganese greensand or activated carbon.

  3. 3

    Aerate the water. Aeration with oxygen is another way to convert the dissolved iron into ferric iron that can be filtered out.

    Oxidising Filtration Methods

  1. 1

    Employ manganese greensand as a chemical oxidant as still another method. Greensand, which consists of grains of glauconite coated with manganese oxide, has a relatively high capacity of iron removal.

  2. 2

    Filter the water with a proprietary granular filter medium as another option. The medium acts as a catalyst and enhances the reaction between oxygen and iron. The insoluble iron can then be filtered out.

  3. 3

    Use a natural ore of manganese dioxide to oxidise and filter out the insoluble iron as still another method.

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