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A filter can be used to treat urban as well as rural water. The most common contaminants of rural surface water are impurities released from the fertilizers and pesticides used for unhindered growth of crops and plants . The surface runoff, after a flush get mixed with nitrate,sulfate and some other inorganic and also organic micro-constituents which are present in the cultivators watershed and may have been consumed by the crop itself. However without the runoff, it could have never reached the surface water sources like rivers and lakes. To know how to select a filter for rural water, a presentation was prepared which can be accessed from here.