Detroit we have seen many problems with our water and sewer pipe-lining her recently. Waiting for a complete sewer line failure is the last thing we need in Detroit. The clay sewer pipes used during construction in the 1930s through 1950 seem to be the culprit for cracks or corroding sewer-liner pipes. The smoke test is a way to test for these defects in your sewer pipe. The problem that caught Detroit city officials’ attention was on rainy days, when the flow reached near 10 million gallons. It indicates that cracks and holes have allowed rainwater to rush into the sewer system. Detroit, to learn more about smoke testing call Perma-Liner and for all your sewer-pipelining needs call toll free at 866-336-2568 or visit our website at www.perma-liner.com.