Zhengzhou city runs a through inspection for its municipal facilities.
According to collected research results and status the city sewer pipes were mainly built more than 20 years ago.
And the most of those pipes work nostop without proper maintenance.When it rains ,the city is filled with filthy water.
These give rise to lots of concerns about public health.
The inspetion will be carried out mainly with IPS sewer crawlers and some two sonar from other suppliers.