Water Treatment
Iron Removal Filter
An iron-removal filter treats water affected by dissolved iron and, where present, manganese that can cause staining, deposits, metallic taste and operational problems.
Pure Waters
Design • Fabrication • Installation • Maintenance
Why iron removal is required
Dissolved iron may be colourless when water is first drawn, but exposure to air can produce yellow, orange or brown staining and sediment. Iron deposits can mark plumbing fixtures, laundry and process equipment.
Manganese can create dark staining and similar taste or deposit problems. The appropriate treatment arrangement depends on the form and concentration of these constituents, together with pH and other water characteristics.
Oxidation and filtration principle
The treatment process converts soluble ferrous iron into an insoluble ferric form that can be captured by filter media. Oxidation may be achieved through aeration or controlled chemical dosing, followed by contact time and filtration.
Periodic backwashing removes accumulated solids from the media and restores the flow path.
Typical treatment sequence
- Test the raw water for iron, manganese, pH, hardness and related parameters.
- Introduce air or a suitable oxidant to convert dissolved iron.
- Provide sufficient contact time for the reaction to develop.
- Pass the water through selected filtration media.
- Backwash the filter at the required interval and monitor treated-water quality.
System considerations
- Raw-water chemistry and daily flow
- Peak demand and required service flow
- Selection and depth of filter media
- Availability of backwash water and drainage
- Automation of valves and control sequences
- Space for vessels, pumps and associated piping
- Ongoing testing and media maintenance
Discuss your iron removal filter requirement
Share the water source, flow, treatment objective and site conditions with Pure Waters.