What is meant by chlorine demand?

Chlorine demand refers to the amount of chlorine that is required to neutralize contaminants and impurities in pool water. This includes organic materials such as leaves, sweat, urine, and other substances introduced by bathers, as well as inorganic contaminants like chloramines that form when chlorine reacts with these impurities.

When measuring chlorine demand, the goal is to determine how much chlorine is needed to ensure that water is free from harmful microorganisms and has an optimal balance for sanitation. This concept is crucial in maintaining safe swimming conditions and achieving effective disinfection, as inadequate chlorine levels can compromise water quality and swimmer safety.

Understanding chlorine demand helps pool operators make informed decisions about how much chlorine to add, ensuring that the water remains clear and safe while avoiding excessive chemical use that could lead to irritation or other issues.