Chlorine dosage is equal to what?

Chlorine dosage is defined as the amount of chlorine added to water, which is made up of the chlorine demand and the chlorine residual. Chlorine demand refers to the amount of chlorine that is consumed by organic and inorganic materials present in the water. It is the quantity of chlorine needed to achieve effective disinfection and oxidation.

In practical terms, when chlorine is added to water, some of it reacts with contaminants, which is reflected in the chlorine demand. The remaining chlorine that does not react with the contaminants is referred to as the chlorine residual. This residual is important because it indicates the amount of chlorine still available in the water to continue providing disinfection after treatment.

Thus, the correct understanding of chlorine dosage includes both the chlorine demand (the amount needed to react with contaminants) and the chlorine residual (the remaining available chlorine), making the combination of these two values equal to the total chlorine dosage.