Purolite, founded in 1981 and headquartered in Bala Cynwyd, Pennsylvania, United States, was acquired by Ecolab for approximately $3.7 billion in October 2021, following historical funding of about $135 million. Specialising in high-performance ion-exchange and adsorbent resins, Purolite serves critical sectors such as pharmaceuticals, water purification, semiconductors, and power. Now operating as Purolite, an Ecolab company, it continues to advance purification and separation technologies for high‑growth life sciences and industrial markets.