The introduction of a dosing unit for sulphuric acid at the Grane waterworks of the Harzwasserwerke GmbH in Germany has reduced the quantity of aluminium sulphate required for the treatment of the barrage water. The operating times of the filters were increased while the quantity of residue was reduced. Also, the availability of the treatment plant and its capacity were increased. The treatment residues are now separated in the newly installed solid treatment plant. The sludge with a residual water content currently 20% (containing contaminants originating from the barrage water and applied flocculants) is used in a brick factory.

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