Heil- und Mineralbrunnen GmbH is located in Fachingen near Limburg an der Lahn. The Fachinger spring near Diez an der Lahn is discovered - probably by the Diez judiciary and surgeon Bender in 1742. Its source in the Lahn valley, bordered by the heights of the Westerwald and the Taunus, at a depth of up to 900 metres. Over the course of more than 100 years, the water has dissolved and absorbed important minerals and trace elements from underground source rock.