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When minimising the health risks of chemical pollution, it is very important to understand the industry and other human activities in the catchment area and near vicinity of the bathing water, and whether direct or indirect discharges of pollutants are made to the bathing water.  Different measures can be applied when reducing the risk of such hazards. In Lake Mälaren in Sweden, 95% of mercury in the sediment was successfully isolated by covering the polluted lake bed with artificial bottom sediment (Box 11).