• Not approved for reporting
• For visual comparators only. Not to be used with digital colorimeters
• Use DPD1 to measure for free chlorine
• Add DPD3 to the same sample to measure the total chlorine
• Use DPD4 if you want to measure total chlorine only
• Tablets are packaged in foil seal packets with 10 tablets per packet
   
• DPD Liquid
• DPD Colorimeter Grade Tablets
• Chlorine Index
• Reagents Index

1. Rinse test tube with sample leaving two or three drops.
2. Add one DPD No. 1 tablet and crush. Fill test tube to 10 mL mark and mix to dissolve.
3. Take the test reading. - see instrument instructions (Free Chlorine)
4. Continue the test on the same test portion.
5. Add one DPD No. 3 tablet, crush and mix to dissolve.
6. Stand for 2 minutes.
7. Take the test reading. (Total Chlorine)

Combined Chlorine = Total Chlorine - Free Chlorine

PURCHASE TEST TABLETS