Seoul Muljae-saeng Cheheomgwan is a museum in Magok-dong, Gangseo-gu, Seoul, that runs exhibitions and water-play activities about tap water and sewage. Outside there is a park for walks and picnics, and a tube slide connects the second floor to the first. Entry is free, and the exhibits are set up so children learn about water through hands-on activities. The reservation process is cumbersome.