It is used in analytical chemistry for the colorimetric determination of free chlorine (0.11.0 ppm range) in water textiles and industrial samples and occasionally in organic synthesis as a reagent mixture.

Its main purpose is to liberate iodine from iodide via oxidation by free chlorine (Cl 2KI 2KCl I) forming a measurable color complex for titration or spectrophotometric quantification.

Chlorotex reagent is a proprietary clear colorless to pale yellow liquid analytical solution (density 0.80.9 gcm boiling point 81C flash point 21C) formulated primarily for chlorine detection containing components like potassium iodide potassium dihydrogen orthophosphate isopropyl alcohol and water.