Supply of 27 Spare Chemical Reagents For Hach Make Model: Cl- 17 Chlorine Analyzer: D P D Indicator Powder 24Gm. Chemical Reagents For Hach Chlorine Analyzer Model No. Cl-17: Buffer Solution For Free Chlorine 47 Chemical Reagents For Hach Chlorine Analyzer Model No. Cl-17: Free Chlorine Indicator Solvent 473