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Smoke testing is a routinely used procedure during which smoke is forced into a gravity sewer line using a fan or blower at low pressure. If there are any holes, cracks or other defects in the sewer line, smoke will seep through and visually identify the problem area.
The smoke that is introduced is non-toxic to humans and animals. It does have a slight odor and is white to gray in color but it will not create stains. Smoke used in smoke testing is not a fire hazard. If you do come into contact with the smoke, please wash affected areas with soap and water.