How is the water from the toilet basin flowing to the floor tiles?

Usually many husbands' rooms are like this. Because of the long time, the house has settled, which causes the deformation of underground sewers and is easy to cause blockage. As soon as the people upstairs release water, they can't be discharged from the underground sewer in time, so they come out from the people's pool downstairs.

Therefore, it is best to find a property dredge once a year.