Key Difference â Aggregate vs Average Aggregate and average are two terms that are often used in calculations. However, these two terms mean two different things. Aggregate refers to the total sum of elements in a data set whereas average refers to the central value in a dataset. This is the key difference between aggregate and average. What Does Aggregate Mean? Aggregate is an adjective and a noun which refers to something formed or calculated by the combination of several separate elements.
Hypochlorous acid and hypochlorite ions, when combined, is known as free chlorine. Both of these establish equilibrium and are both temperature and pH dependent at 7.5 pH and 77Â°F (25Â°C). Hypochlorous acid is more potent than hypochlorite ions in terms of disinfection.
Testing and Levels. To determine the levels of free and combined chlorine in the water, first test to determine the level of free chlorine, then test to determine the level of total chlorine. The difference between the two levels is the level of combined chlorine. To maintain adequate disinfection capability, the level of free chlorine in the water should not be below 1 part per million. In general, the free chlorine level should remain between 1.5 and 2.5 parts per million.