The plumbing system for a apartment building is the same as a single family home system, only it branches out to provide water to each unit.. One of the most difficult things in a apartment buildin is getting enough pressure for water to reach each unit.
Fresh water uses pressure to get fresh water to all the units but the waste water system always aims downward and vents in the system lets air in this allows waste to flow much easier. Traps in the system stops waste from coming back up.
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