Abstract
1. A retention time of 150 days in the storage reservoir leads to a quite considerable reduction in copper and lead concentration (around 75% for lead and 50% for copper), while a levelling-off in the marked variations in the water flowing in is also found. 2. Copper concentrations in the storage reservoir and the model reservoirs show a less constant picture with time then lead concentrations. This may well be caused by the absorption of copper by e.g. phytoplankton. 3. Treatment of the water with Fe++ or AVR seems to have no effect on the removal of lead or suspended matter. 4. Because of the small number of measurements it is difficult to quantify these results. 5. For statements about seasonal trends, measurements must be made over a period of at least three years; they must be made at least once a week and the sampling procedure as regards place and frequency must remain unchanged. 6. The available data indicate that in spite of the effect of mobilisation the removal of the two metals is such that sudden drastic rises of concentration in the unfiltered surface water entering the purification installation is not to be expected.
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