There is provided a fluid composition comprising (a) one or more non-chlorinated 3-isothiazolone, (b) 0.7% to 10% by weight, based on the weight of said fluid composition, one or more primary alkanolamine, (c) 2% to 30% by weight, based on the weight of said fluid composition, one or more tertiary alkanolamine, (d) one or more stabilizer selected from the group consisting of iodine-containing stabilizers, mercaptobenzothiazole, and mixtures thereof, wherein the molar ratio of said stabilizer to said non-chlorinated 3-isothiazolone is from 0.2:1 to 5:1.
