The Nalco Company, with headquarters near Chicago, Illinois, USA, is the world leader for integrated water treatment and process improvement, focusing on water treatment and process chemicals.

• 纳尔科公司总部位于美国伊利诺斯州的芝加哥附近，是水处理和工艺过程处理化学品解决方案的领导者，主要服务领域为水处理和过程处理。