Phosphite aqueous solution is widely used in agriculture as a fungicide and fertilizer additive. It helps in controlling various plant diseases caused by oomycetes, such as Phytophthora and Pythium species. The solution is applied as a foliar spray or soil drench, enhancing plant resistance to pathogens and promoting healthier growth. Additionally, it is utilized in water treatment processes to control corrosion in pipelines and boilers. In the chemical industry, it serves as a reducing agent in certain synthesis reactions and as a stabilizer in the production of polymers and plastics. Its versatility makes it valuable across multiple sectors.