A lot of stuff in Japan in pretty efficient, and a lot of things are there to make everyday life easier.
When I first saw this I kinda went “wtf…?”, but it IS clean water, though it still is a bit strange to see.
Whenever you flush Clean water comes out of the spout, then down the drain into the back part of the toilet, and eventually into the bowl.
Didn’t actually try to wash my hands with it though ;p
