Blocked Drain Korea #10 Enter the manhole to find out the real cause of a blocked drain"

A manager of a company occupied building asked us to unclog the drain.
When we visited the site first, we were able to see the pipes inside manholes.
However, when we visited again a month later to clean the pipe,
we were shocked to know that one manhole was full of dirty water. (only in a month!!)
Even more, one of our team had to enter the manhole to find out the real cause of a serious blocked drain.

Видео Blocked Drain Korea #10 Enter the manhole to find out the real cause of a blocked drain" канала Blocked Drain Korea