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COD Digestion Vials, High Range, pk/150 – Similar Products – Hach Hach’s USEPA-approved dichromate COD Method is the most widely used chemical oxygen demand (COD) method for NPDES reporting in the world. COD Digestion Vials, Low Range, pk/150 | Hach USA – Details Small reagent volumes used in Hach COD vials minimize the volume of spent silver, mercury and chromium waste. Customers in the contiguous 48 United States  COD Digestion Vials, Low Range, pk/150 | Hach USA ...

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