FIELD: chemistry.
SUBSTANCE: invention relates to a method of fighting microorganisms in a water system. The method includes the processing of the water system with an effective quantity of a formula 
I compound, where the water system has the pH value of 6.9 and higher. In formula I X represents a halogen; R and R1 represent, respectively, hydroxyalkyl and cyanoradical (-C≡N), or R and R1 represent, respectively, hydrogen and amidoradical of formula 
.
EFFECT: method makes it possible to effectively fight microorganisms in water systems with the higher pH value.
8 cl, 7 dwg, 6 tbl, 9 ex
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