We would like to congratulate Dr.-Ing. Michael Garbowski on his doctorate. On 09.07.2021 he successfully defended his dissertation entitled "Arsenic removal with Ultra-Low-Pressure Ultrafiltration (ULPUF) combination processes for water treatment in developing countries". The examination committee consisted of Prof. Dr.-Ing. Franz-Bernd Frechen (Uni Kassel), Prof. Dr.-Ing. Thomas Wintgens (RWTH Aachen) and Prof. Dr.-Ing. Tobias Morck (Uni Kassel) under the chairmanship of Prof. Dr. Matthias Gaßmann (Department of Hydrology and Mass Balance, Uni Kassel).