Founded in 1925 as a beer distributor, Carolinen has since established itself as a market leading supplier of mineral water in East Westphalia-Lippe and large parts of Westphalia. Carolinen is a trademark of the Mineralbrunnen Wüllner Group based in Bielefeld. The Group also includes Gaensefurther Schlossbrunnen and Güstrower Schlossquell, both mineral water suppliers. The main focus of the Group is in the production of mineral water and soft drinks for the retail and hospitality industries.