Hach DPD Free Chlorine Powder Pillows are used for free chlorine determination by the DPD Free Chlorine method. They are available in 5 ml, 10 ml and 25 ml sample sizes and provide accurate free chlorine residual results from 0.02 to 2.00 mg/l.
These free chlorine reagents are USEPA accepted for reporting for drinking water analysis using Hach Method 8021.
5 ml powder pillows are commonly used in Hach color wheel test kits
10 ml powder pillows are commonly used in Hach pocket colorimeters
25 ml power pillows are commonly used in Hach DR890 and DR900 colorimeters.