Used in water treatment to remove phosphates and as a coagulant aid in clarifying drinking water. Commonly added to soil as a micronutrient to correct iron deficiency in plants, especially in alkaline soils. Employed in the manufacturing of inks, dyes, and pigments due to its reducing properties. Utilized in dietary supplements and pharmaceuticals to treat or prevent iron-deficiency anemia. Also serves as a precursor in the synthesis of other iron compounds and in the production of iron-based chemicals.