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Despite its effectiveness, the use of chlorine has its challenges. Concerns regarding the formation of disinfection byproducts such as trihalomethanes (THMs) have prompted water treatment facilities to explore alternative disinfectants and complementary methods, including ultraviolet (UV) light and ozonation. Nonetheless, chlorine remains a staple in the disinfection process due to its proven efficacy and cost-effectiveness.
two chemicals used to treat water in water treatment plants

5. Performance Additives These additives enhance specific functionalities such as flame retardancy, antibacterial properties, and slip or anti-blocking effects. For example, intumescent additives can improve fire resistance, making plastics suitable for more demanding applications.
plastic additives and compounding

Phosphate compounds, such as phosphoric acid, are also introduced in certain wastewater treatment processes to help control the growth of algae in surface water bodies
. By precipitating phosphorus, these chemicals diminish the likelihood of eutrophication, a process that leads to excessive nutrient accumulation and detrimental algal blooms.