A New Solid Isothiazolone Biocide for Industrial Water Treatment

Chloromethyl-methylisothiazolone (CMIT/MIT) biocide has been widely used for microbial control in a variety of industrial water treatment applications.  It has broad spectrum activity versus various types of bacteria (including Legionella, biofilm-formers and sulfate-reducers), algae and fungi.  A new solid tablet formulation has recently been developed for dosing CMIT/MIT biocide in small to medium sized cooling systems.  This new solid dissolves rapidly and has improved safety and handling features.  The tablet is completely water soluble, leaves no residue, has good compatibility with standard materials of construction, and is wrapped in a water soluble film.  The paper will describe the physical-chemical characteristics of the new solid and review results of lab studies and field trials.