FIELD: chemistry.
SUBSTANCE: invention relates to biocides. A synergic antimicrobial composition contains: (a) hydroxymethyl-substituted phosphorus-containing compound, which represents tetrakis(hydroxymethyl)phosphonium salt; and (b) cis-1-(3-chloroallyl)-3,5,7-triaza-1-azonium-adamantane chloride. A weight ratio of (a) and (b) in the composition constitutes from 15:1 to 1:15. To inhibit growth of microorganisms in a medium, which has a temperature at least 60°C and content of sulphides at least 4 ppm, the said composition is added.
EFFECT: invention makes it possible to increase the composition activity.
10 cl, 2 tbl, 1 ex
