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You don't calculate it You measure it based on the water you are using.
Read:
https://wedc.lboro.ac.uk/resources/who_notes/WHO_TNE_11_Measuring_chlorine_levels_in_water_supplies.pdf
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You don't calculate it You measure it based on the water you are using.
Read:
https://wedc.lboro.ac.uk/resources/who_notes/WHO_TNE_11_Measuring_chlorine_levels_in_water_supplies.pdf