KIT FOR COLORIMETRIC DETERMINATION OF CHLORINE LEVELS IN SAMPLES OF RECREATIONAL WATER

A kit for the colorimetric determination by TMB of the concentration of active chlorine in drinking water or water used for recreational purposes comprises a liquid container suitable for housing a predetermined amount of liquid of which the concentration of active chlorine is to be measured, a colorimetric reference scale, and a chlorine indicator reagent designed to be placed in said container in a specified amount. The reagent contains a weighted amount of TMB so that the whole recommended range of values of chlorine concentration in water is shown by the change in at least three different colours of the solution comparable with corresponding colours of the reference scale, so that visual evaluation of the measurement results with the naked eye is simple, accurate and rapid.