Determine free chlorine levels with confidence using our DPD Free Chlorine Reagent. These powder pillow reagents, specifically designed for Free Chlorine determination by the DPD Free Chlorine method, are USEPA accepted for reporting in drinking water analysis using Hach Method 8021. Perfectly compatible with Hach’s chlorine visual test kits, they come in a handy pack of 100 powder pillows, each for a 5 mL sample size, ensuring precision and reliability. With a measuring range up to 3.5 mg/L Cl₂ and boric acid-free formulation, these reagents offer safe and accurate results. Trust Scientific Supplies & Technology Inc. for all your medical and water testing needs.