We have a huge water purification plant in Kamanachi and this retrospective triangle hat building is a water-pump-up tower. It pumps up the water from Edogawa river and get flowed to the Kanamachi water purification plant. The purified water is finally delivered to the Tokyo metropolitan residents. This tower is located 1 km east of Hana-An. How about taking a walk and visiting there, it is so fun!!