東京都水道局の広報アニメ

https://www.youtube.com/watch?v=kQz0kY1uz6Y

https://www.youtube.com/watch?v=0htNa736UDo&pp=ygUe5p2x5Lqs6YO95rC06YGT5bGA44CA44Ki44OL44Oh

https://www.youtube.com/watch?v=vEloBbR6C10&pp=ygUe5p2x5Lqs6YO95rC06YGT5bGA44CA44Ki44OL44Oh

https://www.youtube.com/watch?v=Fyy2k4pvVD8&pp=ygUe5p2x5Lqs6YO95rC06YGT5bGA44CA44Ki44OL44Oh