Drinking water distribution: corrosion control in Swedish municipalities

Swedish action on corrosion control in drinking water distribution systems is evaluated. The extent to which chemicals are used and the costs of diffe rent processes are examined and the theoretical calculations of corrosion c ontrol effects an made. Improved measuring techniques and process evaluatio ns are recommended with the objective of obtaining a more effective use of the chemicals. The content of copper and iron in water from different Swedi sh municipalities, before and after water treatment, was calculated using e quilibrium models. The actions slightly decrease the iron corrosion in comp arison with the drinking water without corrosion control, while the copper content in the water is somewhat increased.