Pool Test Kit DPD1 Tablets Sheet of 10

Pool Test Kit DPD 1 Tablets. Diethyl-p-phenylenediamene (DPD) tablet 1 dissolves rapidly to determine the chlorine or bromine content of your pool. It reacts with the pool water sample, changing its colour in various shades of red - the deeper the colour, the higher the concentration of the sanitize (chlorine or bromine) present.