Used as a coagulant and flocculant in water and wastewater treatment to remove suspended solids, phosphates, and heavy metals. It helps clarify water by forming insoluble iron phosphate precipitates and enhancing the settling of particles. Commonly applied in municipal sewage treatment and industrial effluent systems from sectors such as textiles, paper, and food processing. Also utilized in soil stabilization and as a precursor in the production of other iron-based chemicals. In agriculture, it serves to correct iron deficiency in soils and as a moss control agent in lawns. Additionally, it finds use in the dyeing industry as a mordant to fix colors on fabrics and in chemical analysis laboratories for testing specific ions.