We had a new sink installed. (The new sink is deeper than the old sink.) The sink worked fine for the first day, but then stopped draining entirely. Our building superintendent says that the apartments above and below ours have not reported any issues and insists it must be an installation issue. Our contractor, who has already been paid, is unresponsive and insists it is not an installation issue.
We tried plunging and using a drain cleaner (similar to Drano) to no effect. A plumber snaked the pipe for 25 feet to no effect. Finally, a second plumber used a kinetic water ram. After the second plumber, the sink started working again. We were able to use it last night, but this morning it no longer drains.
What could possibly cause the sink to drain for a day but then stop entirely? Just having a theory would be useful. Our contractor, superintendent, and the plumbers are all blaming someone else and refusing to help. I want to have an idea for why so I can take a next step.