Used in water treatment to remove phosphates and control hydrogen sulfide in wastewater systems. Acts as a coagulant aid in clarifying water by helping to aggregate fine particles for easier removal. Applied in agriculture as a micronutrient to correct iron deficiency in soils, especially for crops grown in alkaline conditions. Used in the manufacturing of iron-based chemicals and dyes. Employed in the pharmaceutical industry as a dietary supplement to treat iron-deficiency anemia. Also utilized in the production of ink and in the leather tanning process to enhance dye uptake and improve color fastness.