What is the purpose of chemical additives in water treatment?

Chemical additives in water treatment primarily serve the purpose of removing contaminants from water. This is crucial for ensuring that the water is safe for consumption and meets health standards. The use of various chemicals can target specific pollutants, such as pathogens, heavy metals, and organic compounds, effectively reducing their concentration or neutralizing them in the water.

For example, chlorine is commonly used as a disinfectant to kill harmful bacteria and viruses. Other additives, such as coagulants, help in the aggregation of particulate matter so they can be more easily filtered out. By effectively treating the water with these chemical additives, the overall quality is improved, making it safe for drinking and other uses.

While there are other benefits associated with water treatment—such as improving taste, adding essential minerals, or enhancing color—these are secondary to the main goal of ensuring potable water is free from harmful substances. Thus, the correct answer emphasizes the primary function of chemical additives in the context of water treatment processes.