The water treatment in the schools consists of a filter and a water tank with a capacity of 450 to 1000 liters. The filter purifies the water in three steps. In a first step, the coarsest pollutants in the water are filtered out. Step two uses an activated carbon filter that absorbs the smallest particles and volatile organic pollutants. This ensures that the water does not smell or taste strange. In the last step, a UV filter is used that kills microorganisms such as bacteria, viruses and pathogens. The filters are replaced every six months to ensure smooth operation and water quality. Some schools also have challenges with littering plastic bottles. With the water treatment system, plastic waste in schools is also reduced. The project developer works with local organizations to adapt the program and technology to local conditions.