Used in water treatment processes to remove impurities and phosphates due to its strong coagulant properties. Commonly applied in wastewater treatment plants to help clarify water by promoting the aggregation of fine particles.

Also utilized as an etching agent in the production of printed circuit boards (PCBs), where it selectively removes excess copper to create electrical circuits.

Employed in the production of other iron compounds and as a catalyst in various chemical reactions. In laboratory settings, it serves as a reagent in synthesis and analytical chemistry, such as in tests for phenols or in organic transformations.

Additionally, it finds use in the textile industry for dyeing and printing fabrics, acting as a mordant to fix dyes to fibers. It is also applied in metal surface treatments to prevent corrosion and in agriculture as a source of iron for soil conditioning and plant nutrition.