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Factor & Method: Free & Total Chlorine: Low concentrations of free, total, and various forms of combined chlorine are determined colorimetrically using DPD tablets or liquids, or by ferrous ammonium
sulfate/DPD titration. Higher concentrations are best determined using iodometric titration, which indicates total chlorine only
Test system: DPD Tablet octa-slide
Range/Sensitivity: 1.0, 1.5, 2.0, 2.5, 3.0, 4.0, 5.0, 6.0 ppm
# of Tests (# of reagent): 50 (2)
Image for illustration only.
