SW Umwelttechnik Stoiser & Wolschner AG engages in the development and production of precast concrete parts for infrastructure projects. It operates through the Water Protection and Infrastructure business segments. The Water Protection segment develops, manufactures, and distributes mineral oil separators, biological treatment plants, manholes, sewage pipes, pumping stations, and drinking water storage. The Infrastructure segment offers prefabricated parts for building construction, bridges, passageways, slope reinforcements, telecommunications and power supply towers, ceiling systems, and prefabricated staircases. The company was founded by Josef Stoiser and Karl Friedrich Wolschner in 1910 and is headquartered in Klagenfurt, Austria.