Internationale Organisation für naturnahe Badegewässer (IOB)

It has 14 national associations and members in 23 countries around the world. It represents about 600 individuals and companies primarily involved in the design and construction of baths with biological water treatment.
Stefan Bruns is a founding member and served as director of the IOB until 2018.
As an active member, Polyplan-Kreikenbaum is regularly involved in the organization of international congresses. Presentations are also regularly brought to the congresses.