How is chlorination dosage typically expressed?

Chorination dosage is typically expressed in parts per million (ppm) because this unit provides a clear and standardized way to measure the concentration of chlorine present in water. PPM represents the mass of a substance (in this case, chlorine) in a given volume of water. Specifically, one ppm indicates one milligram of chlorine per liter of water, making it particularly useful for measuring chemical concentrations at low levels. This precision is essential in water treatment processes to ensure effective disinfection while preventing potential over-chlorination, which can lead to harmful byproducts.

Other units, such as gallons per minute, liters per hour, or cubic meters per day, focus on flow rates or volumes, rather than concentration, which is crucial for determining the appropriate dosage of chlorine needed to achieve efficient disinfection levels in the water supply.