Hach® DPD Free Chlorine Reagent Pillows, Powder, 10 mL, 1,000/Pack

These free chlorine Powder Pillow reagents are USEPA accepted for reporting in drinking water and wastewater analysis using Hach Method 8021. For best results use with a Hach colorimeter or spectrophotometer. Range from: 0.02 to 2.00 mg/L Cl₂.