Chlorine DPD Disc, Hellige

This disc uses the Standard Method DPD procedure to indicate efficiency of chlorine application in water and wastewater treatment plants, as well as in pollution control. Permanent non-fading glass colour standard is featured. Intended use with No. 673-700-11 Hellige Pocket Comparator and Standard Colour Comparator. Price for each Disc includes 50 DPD No. 1 tablets, 50 DPD No. 3 tablets and plastic stirring rod.
DPD No. 1 tablets are for free available chlorine only. When DPD No. 3 tablets are used with No. 1 tablets, an increase in colour represents monochloramine form of chlorine.