Thiodisuccinic acid is primarily used as a chelating agent in various industrial and household applications. It effectively binds to metal ions, making it useful in water treatment processes to prevent scale formation and corrosion in boilers and cooling systems. In detergents and cleaning products, it enhances the performance by softening water and improving the removal of dirt and stains. Additionally, it is employed in the textile industry to stabilize dyes and improve color fastness. Its biodegradable nature makes it an environmentally friendly alternative to traditional chelating agents like phosphates.