Grünberg's assessment of service and support by the Wirtgen Group subsidiary in Windhagen was also positive. A few weeks later Christoph Obalski, a member of the sales team of Wirtgen Group, was on site again when the acquisition of a screening plant was being discussed. In January 2017, the MOBISCREEN MS 21 Z was already put into operation at D + H as a demonstration plant. This plant also had a higher performance in comparison with the previous screening plant combined with improved fractioning of the recycling material. As a result of the high performance, a second MS 21 Z was already in operation by March. "Thanks to all-round work platforms, the screen decks are easily accessible and can be quickly readjusted by operators", says Thomas Verhuven, site manager at D + H. Both plants can be operated very quietly, which facilitates the authorization process.