As an aside, for industrial ...

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As an aside, for industrial water treatment, always feed an approved biodispersant 1/2 hour prior to dosing Cl2 and always shut off the blowdown. Always calculate the Half Time Index so that you will know when Cl2 is depleted for you to work out the next dose. Cl2 works best at pH less than 7.5. If there are humus and organic matter in the water, Trihalomethanes will form. You must be careful in your testing to take account of that.