A German chemicals, rubber and plastics manufacturer formed in 2004 through the spin-off of Bayer AG's chemical and polymers business. LANXESS manufactures ion exchange resins for municipal and industrial water treatment applications through its Liquid Purification Technologies business unit. Primarily active in Europe, the firm also has interests in the Asia-Pacific region and in the Americas. The company sold its RO membrane division to Suez in 2021.