1. KWR Watercycle Research Institute, PO Box 1072, Nieuwegein 3430 BB, The Netherlands
2. Water utility Oasen, PO Box 122, Gouda 2800 AC, The Netherlands
3. Water utility Pidpa, Desguinlei 246, Antwerp 2018, Belgium
4. Water utility Vitens, PO Box 1205, Zwolle 8001 BE, The Netherlands
5. Now at water utility WML, PO Box 1060, Maastricht 6201 BB, The Netherlands
6. Water utility Brabant Water, PO Box 1068, BC's-Hertogenbosch 5200, The Netherlands