The core activity of Knecht Brugg Holding AG encompasses a wide range of services and activities that can be categorized into the following main areas: 1. **Construction and Infrastructure**: Construction, demolition, excavation, road and civil engineering, pipeline and water supply construction, spring renovations, asphalt coatings, and repair center. 2. **Transport and Logistics**: Transportation, waste management, skip rental service, paper sorting plant, and e-parks. 3. **Recycling and Environment**: Recycling of minerals and chemicals, chemical trade, basic chemicals (acids and bases), water treatment, and swimming pool chemistry. 4. **Energy**: Renewable energy, particularly photovoltaic systems. 5. **Real Estate and Properties**: Management of properties and commercial areas, land and project development. 6. **Chemicals and Trade**: Chemical trade, basic chemicals, water treatment, and swimming pool chemistry. 7. **Service Stations and Services**: Operation of service stations and provision of services such as customer storage and swimming pool accessories. Overall, Knecht Brugg Holding AG is a diversified company with a wide range of activities in the fields of construction, infrastructure, transport, recycling, energy, real estate, and chemicals.