At least two factors ...

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At least two factors contribute to the deterioration of hypo in storage: presence of debris in the storage tank that can act as catalysts, and high temps. My company's hypo is received as 20% and we use AWWA B300. For more dilute solutions, like when doing studies where chlorine is dosed at or less than 5 ppm, we are comfortable with the Hach portable DPD method.