Disodium etidronate hydrate is a bisphosphonate widely used in the treatment and prevention of bone disorders, including osteoporosis and Paget's disease. It helps inhibit bone resorption, slowing down bone breakdown, maintaining bone density, and reducing the risk of fractures. It is also utilized to treat hypercalcemia associated with certain cancers and to prevent calcium accumulation in soft tissues, such as in patients with chronic kidney disease undergoing dialysis. In dental applications, it prevents calculus (tartar) formation on teeth. Industrially, it acts as a chelating agent to control water hardness and prevent scale formation in systems like cooling towers, boilers, and pipes. Its ability to inhibit calcium salt crystallization makes it valuable in cleaning products and for maintaining the efficiency of industrial equipment.