Many groundwater and bore water sources contain appreciable amounts of dissolved iron and occasionally manganese. On standing in contact with air, dissolved colourless iron is oxidised to form insoluble iron oxide which is seen as red-brown sediment or staining. If manganese is present in the water, it will form brown-black sediments and stains. Iron and manganese stains cannot be removed by common soaps or detergents and buildup over time in pipes, water tanks, taps, irrigation systems and pressure tanks. Chemical cleaning is generally required to remove these stains or buildup of oxidised material from the internal surfaces of pipes and tanks.
Rotek iron removal filters use DMI-65 advanced catalytic filtration media that is well proven to remove both soluble iron and manganese. The media operates through the injection of liquid chlorine into the feedwater immediately upstream from the IRF filter vessel. There is then a rapid reaction in the filter vessel between the oxidiser and the catalytic media to convert the soluble iron and manganese into their insoluble solid forms that are then retained in the media bed. An automatic controller initiates a filter bed backwash to flush any trapped sediment to drain on a time-basis, returning the system to normal operation.
DMI-65 is one of the few catalytic water filtration media that is certified to NSF/ANSI-61 standard suitable for drinking water applications. Applications include ground water treatment, pre-treatment for reverse osmosis and ultra-filtration systems, irrigation, household supply and stock watering.
Complete treatment systems include a dosing pump and chemical storage tank, the IRF filter and media. Installation is straightforward and operation automatic. Prior to final selection, a water analysis is required as well as an estimate of required treated water flow rate. Rotek can then advise of the most appropriate system configuration to best suit your application.