Is it better for the bathroom sewer outlet to flow east or west?

Keep the west side well. According to the relevant public information, it is better to stay from the west, and the east is up. It is a bit inappropriate to use sewers to drain sewage. Sewer is an urban public facility, which refers to the pipes through which buildings discharge sewage and rainwater; it also refers to the underground channels through which cities, factories or villages discharge sewage and rainwater.