Iron, even in small quantities, can be one of the most troublesome elements found in water. As little as 0.3 ppm (parts per million) of iron can cause staining of fixtures, sinks, flooring, and also most anything else it comes into contact with. Concentrations below 0.3 ppm can still have profound adverse effects in manufacturing processes.
Iron affects the tastes of foods and beverages, can contribute to the block-age of pipes, and can cause many other unwanted problems. Since it has so many undesirable properties, iron removal is an important phase of water treatment.
Iron will destroy the exchange resins used in water softening and render the softener useless . Particulate Iron can clog appliance filters and build up is very costly and difficult to remedy in pipes.