Is it easy to rebel on the third floor?

The third floor is not easy to go against the current. The third floor of a tall building will go against the water, but the probability is relatively small. Generally, only when the pipeline on the second floor is blocked will you go to the third floor. In many residential areas, the first floor is launched independently, and the second floor is the lowest point of the main sewer. Therefore, once the water consumption is large and the pipeline drainage is not smooth, the phenomenon of anti-water on the second and third floors appears.