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Reagent set ultra low range hardness determination by the Chlorophosphonazo method. Hach Method 8374. Range: 4 - 1000 ug/L Ca & Mg as CaCO3. Chlorophosphonazo reagent solution is packaged in a 500-mL bottle that is ideal for use with Hach's Pour-Thru Cell. Approximay 250 tests
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