These authentic Hach PermaChem Reagents DPD Free Chlorine Reagent Powder Pillows (Catalog No. 2105569, 100 pk) are pre-formulated, unit-dose chemical reagents engineered for measuring free available chlorine in water and wastewater. Calibrated for 10 mL sample sizes, they react rapidly with free chlorine to generate a characteristic magenta/pink color for precise photometric, colorimetric, or spectrophotometric determination.
Widely utilized across municipal drinking water facilities, swimming pool testing, industrial process water monitoring, and environmental testing labs, this EPA-accepted method ensures maximum convenience and reproducibility. Sealed within individually packaged foil pouches, the PermaChem formulation guarantees protection against ambient humidity, light, and oxidation, maintaining chemical stability over extended shelf storage.





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