The use of a thioammonium or an oxyammonium salt compound of Formula: [R-X-R 1 -NH 3 +] z M -z Formula wherein: R is a straight-chain or branched-chain C 6 -C 24 alkyl or a straight-chain or branched-chain C 6 -C 24 alkyloxy-C 2 -C 3 -alkyl; X is S or O; R 1 is a straight-chain or branched-chain C 2 -C 3 alkyl; z is an integer of at least 1 up to the total number of acidic protons on M; and M is the anion derived from 2-hydroxypropane-1,2,3-tricarboxylic acid; 2,3-dihydroxybutanedioic acid; or 1-hydroxyethan-1,1-diyl) bis (phosphonic acid); to treat water in an industrial water treatment system, by adding the compound of Formula, as a liquid or as a solid or as part of a formulation, to the water of the IWT system in either: a) a continuous or semicontinuous manner or b) in a slug dose manner for 1 day to 2 months; in an amount to provide a concentration from 0.01 to 2000 ppm thereby providing at least two of the following effects:- metal corrosion inhibition, scale inhibition, suspended matter dispersion, biocide efficacy, or biofilm removal/biofilm dispersion; and observing or testing the IWT system to confirm such desired control has been obtained. R is a straight-chain or branched-chain C 6 -C 24 alkyl or a straight-chain or branched-chain C 6 -C 24 alkyloxy-C 2 -C 3 -alkyl; X is S or O; R 1 is a straight-chain or branched-chain C 2 -C 3 alkyl; z is an integer of at least 1 up to the total number of acidic protons on M; and M is the anion derived from 2-hydroxypropane-1,2,3-tricarboxylic acid; 2,3-dihydroxybutanedioic acid; or 1-hydroxyethan-1,1-diyl) bis (phosphonic acid); to treat water in an industrial water treatment system, by adding the compound of Formula, as a liquid or as a solid or as part of a formulation, to the water of the IWT system in either: a) a continuous or semicontinuous manner or b) in a slug dose manner for 1 day to 2 months; in an amount to provide a concentration from 0.01 to 2000 ppm thereby providing at least two of the following effects:- metal corrosion inhibition, scale inhibition, suspended matter dispersion, biocide efficacy, or biofilm removal/biofilm dispersion; and observing or testing the IWT system to confirm such desired control has been obtained. a) a continuous or semicontinuous manner or b) in a slug dose manner for 1 day to 2 months; in an amount to provide a concentration from 0.01 to 2000 ppm thereby providing at least two of the following effects:- metal corrosion inhibition, scale inhibition, suspended matter dispersion, biocide efficacy, or biofilm removal/biofilm dispersion; and observing or testing the IWT system to confirm such desired control has been obtained. in an amount to provide a concentration from 0.01 to 2000 ppm thereby providing at least two of the following effects:- metal corrosion inhibition, scale inhibition, suspended matter dispersion, biocide efficacy, or biofilm removal/biofilm dispersion; and observing or testing the IWT system to confirm such desired control has been obtained. metal corrosion inhibition, scale inhibition, suspended matter dispersion, biocide efficacy, or biofilm removal/biofilm dispersion; and observing or testing the IWT system to confirm such desired control has been obtained.