You may not have a backflow preventer in the main line. This prevents anything coming back from the main line. It may be coming from your neighbors above you on the line.
Either they are on a separate sewer line and connect to the main sewer line later on or they sewerage is pumped by means of a machine into the main sewer line.
Not exactly a sewer main normally flows by graviety and a forced main is a pumped system
Depends on where. In most U.S. states, this is the landlords responsibility.
bass
3" house (building) drain allowable. 4" building sewer line needed for house from sewer main.
The sewer cleanout is typically located on the side of the house near the main sewer line.
1%
yes
That would depend on what type of stoppage FOG* or roots or gravel how one would clear it* Fats oil grease
The most effective methods for main line sewer cleaning include hydro jetting, mechanical rodding, and sewer camera inspection. Hydro jetting uses high-pressure water to clear blockages, mechanical rodding involves using a flexible rod to break up clogs, and sewer camera inspection helps identify the exact location and nature of the blockage for targeted cleaning.
Depends on the "Sink" waste if it is a 2" sink waste a 3/8 cable will be fine.