Ion Exchange (India) Limited, founded in 1964 as a subsidiary of the UK's Permutit Company, is a premier water and environmental-management firm based in Mumbai. Fully Indian-owned since 1985, it offers complete solutions for water treatment, wastewater recycling, solid-waste management, and waste-to-energy. With more than 100,000 installations worldwide, it supplies INDION ion-exchange resins, RO membrane systems, Zero Liquid Discharge (ZLD) plants, and decentralized sewage treatment to power, paper, and food-and-beverage customers as well as municipalities and communities. Its DSIR-accredited R&D centers, running since 1965, and a portfolio of more than 40 patents fuel innovation, including solutions like INDION Lampak for rural water purification. Active in SAARC countries, Southeast Asia, the Middle East, Africa, and North America, the company runs plants in Hosur, Patancheru, Ankleshwar, Navi Mumbai, and Goa, and operates subsidiaries such as PT Ion Exchange Asia Pacific in Indonesia.