maximum amount of a component is 15 times in relation to 1 to other component s typically active chlorine concentrations of min 0 1 to max 15 ppm are added and maintained in the process waters the addition of other components are proportioned in amounts as described above typically the required addition rate as halogen is min 3 g and max 1500 g per produced ton of paper advantageously the amounts are between 10 g and 500 g per produced paper ton the amounts required depend on the water volume of the process process design process dynamicity cod concentration of the process waters and the ph range of the process the temperature of the process has an influence as well a process temperature at above 60 u00b0 c begins to reduce the efficiency because of too vigorous reactivity with organic impurities cod the present method of inhibiting the growth of microorganisms in a paper making process works optimally within the ph range of 7 to 9 however the invention can be applied advantageously across the whole paper making ph range which is from 4 0 to 10 5 the components used in accordance with the present invention are in general compatible with other paper making additives thus for instance it is possible to use the invention together with conventional biocides such as chlormethyl and methylisothiazolones glutardialdehyde peracetic acid dibromonitrilopropionamide and bronopol e g for preservation the following examples illustrates the invention but are not intended to limit it the combined use of sodium hypochlorite naocl and bromochlorodimethylhydantoin bcdmh significantly increases the microbiological inhibiting efficiency.