One means to estimate ...

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One means to estimate required chlorine to achieve drinking water disinfection is to execute a chlorine demand test.  Obtain a sample of the water to be treated, then titration that sample with a known concentration of chlorine while measuring the residual chlorine.  This method provides an estimate of the dosage required for the water and confirmation of residual chlorine would then be recommended prior to the water being deployed in a potable system.