We ION WATER MACHINERIES manufacturer and supplier of Iron Removal Plant.Raw water generally contains soluble iron in form of ferrous bicarbonate and insoluble as ferric hydroxide. Water containing ferrous bicarbonate is clear when drawn from a tubewell, but as soon as it comes in contact with air develops a whitish haze. which on longer standing turns yellowish and then forms yellowish to reddish-brown deposits of hydrated ferric oxide, some of this deposit sticks to the side of the container and the rest sinks to the bottom. Oxidation of ferrous bicarbonate is usually accomplished by the dissolved oxygen introduce into the water by aeration as per following reaction. 2Fe(HCO3)2+ 1/2O2+ H2O> 2Fe(OH)3 + 4CO2 From the above reaction it appears that 1ppm. of dissolved oxygen oxidises 7ppm. of ferrous iron as Fe. As solubility of oxygen from air dissolved in water at 60%F is 10ppm. theoritically water saturated with dissolved air contains enough oxygen to oxidise 70ppm. of ferrous iron.