Used primarily in water treatment processes to remove impurities and clarify water. It acts as a coagulant, helping to bind particles together for easier filtration. Also employed in wastewater treatment to reduce phosphate levels, preventing algae growth in water bodies. In the pharmaceutical industry, it serves as a reducing agent in various chemical reactions. Additionally, it is utilized in the production of ferric chloride, which is essential for etching printed circuit boards. In agriculture, it is applied as a micronutrient supplement to address iron deficiencies in crops.