Aqueous solution containing by weight: - 10,0 % or more but not more than 11,3 % of 5-chloro-2-methyl-2H-isothiazol-3-one, - 3,0 % or more but not more than 4,1 % of 2-methyl-2H-isothiazol-3-one, - a combined concentration of isothiazolones (CAS RN 55965-84-9) of 13,0 % or more but not more than 15,4 %, - 18 % or more but not more than 22 % of nitrates, calculated as sodium nitrate, and - 5 % or more but not more than 8 % of chlorides, calculated as sodium chloride
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