The MBR (Membrane Bioreactor) wastewater treatment plant in Vihdin Vesi, Nummela, was delivered by Artas to the municipality of Vihti. the MBR process was developed to improve wastewater treatment in the region and ensure greater efficiency and environmental friendliness (previously, the conventional activated sludge process had been used in the municipality). The plant has been in operation since 2019.