What is DPD in water treatment?

Related questions

1. Can someone else pick up my parcel?
2. What is DPD in banking?
3. What is DPD in shipping?
4. Do DPD pick up parcels?
5. Is Hermes part of DPD?
6. What did DPD used to be called?
7. Does DPD deliver on weekends?
8. Is Saturday a working day DPD?
9. Are DPD and yodel the same company?
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Tags

1. #either
2. #determined
3. #phenylenediamine
4. #standards
5. #residual
6. #titrating
7. #color
8. #measuring
9. #comparing
10. #method
11. #developed
12. #diethyl
13. #water
14. #stands
15. #chlorine