Wolter Siegers is a Generic-B researcher. He worked on research in water treatment for drinking water, wastewater and industry water. He specialises in adsorption of materials, NOM characterisation and particle measurements. Another important specialty Wolter has is translating research questions into practical work. In addition, he worked a lot with oxidation, membrane and adsorption processes for the removal of unwanted substances from water. He built his expertise by planning, detailing and carrying out many projects in this field.