3rd floor sewer overflows to 2nd floor

Hello, everyone.
Welcome to the Plumber Story channel.

It's a hydrojet video of the sink drain.
Our sink drain is unconditionally on the floor.
It may be awkward because it is very different from other countries.
The drain in the kitchen sink was backflowing.
Second floor - cleaning the kitchen drain
1st floor - main sewer line cleaning

Thanks for watching

Видео 3rd floor sewer overflows to 2nd floor канала Plumber Story