On many Japanese toilets, the hand wash sink is attached so that you can wash your hands and reuse the water for the next flush. Japan saves millions of liters of water every year doing this.

@redfrog
Strange Japanese toilets with paper. Usually they don't use that but (hot) water streams.

Are you sure this is in Japan?

@Beurt @redfrog A friend of mine has installed one in her flat, she saw this in India

@numahell @Beurt @redfrog

I saw this in a guest house in France.

One day I will install it at home.

@redfrog
That's a myth. Many toilets in Japan are not fitted with water washing.
@redfrog this is so freaking smart! 🤩
@redfrog @declan I have a (Swedish) friend here in Australia who has something similar. I was totally blown away when I saw (used) it.
@redfrog
And how many liters lost using these anal Kärcher ?
@solar10 Not much actually. During use the amount of water used this way is low, and that picture an overdramatization.