Mülheim method
The Mülheim process is a globally recognized process for the production of drinking water .
The process was developed in 1974 by the water scientists at RWW Rheinisch-Westfälische Wasserwerkgesellschaft mbH in collaboration with the Engler-Bunte Institute for the Dohne waterworks in Mülheim an der Ruhr .
In the process, the usual use of chlorine for water treatment can be largely dispensed with. Instead, the chemical and biological treatment of the water is carried out by means of ozonation , multi-layer filtration (over gravel , sand , weakly activated charcoal) and activated carbon filtration .