Benzalkonium chloride is widely used as a disinfectant and preservative in various industries. In healthcare settings, it is commonly applied as an antiseptic for skin and mucous membranes, as well as for disinfecting medical instruments and surfaces. It is also a key ingredient in many hand sanitizers, wound cleansers, and eye drops due to its antimicrobial properties. In the household sector, it is found in cleaning products, such as surface disinfectants and wipes, to eliminate bacteria and viruses. Additionally, it is used in personal care products like shampoos, conditioners, and cosmetics to prevent microbial growth and extend shelf life. In water treatment, benzalkonium chloride serves as an algaecide and biocide to control microbial contamination in swimming pools and industrial water systems. Its versatility and effectiveness make it a valuable component in maintaining hygiene and safety across multiple applications.