Iron and Sulphur Bacteria: Iron bacteria and sulphur bacteria are small living organisms that naturally occur in soil, surface water and groundwater. Iron bacteria may form large masses of an orangey-brown slime, while sulphur bacteria will be black. Sulphur-reducing bacteria live in oxygendeficient environments. They break down sulphur compounds present in water, producing hydrogen sulphide gas in the process. Ozone kills and removes the organics in water that cause iron and sulphur bacteria. Iron bacteria in toilet tank
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