FAS-DPD Test Kits4 Results
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The FAS-DPD variation of the traditional DPD method allows users to measure both free and combined chlorine levels as low as 0.2 ppm (the maximum allowable level according to most health authorities as well as the Pool and Hot Tub Alliance). The high measurement is 20 ppm. By contrast, the color comparators used with the regular DPD generally allow readings as low as 0.5 and 1ppm and as high as 5 or 10 ppm.