Catalog number: PR97 Features: ●If the chlorine checker turns pink when you put it in, it means that there is residual chlorine. Uses: ●When you add the powder to water, the color will change and you can see the concentration of residual chlorine. ●Can be used as a guide for replacing water purification cartridges. Specifications: ●Ingredients = D.P.D Reagent (NN-Diethyl-p-phenylenediamine sulfate, anhydrous sodium sulfate)
