Any debris in the pipe is pulled back with the water. The debris is removed from the manhole with a powerful vacuum on the combination truck.
Air Venting
During cleaning of sanitary sewer lines, air occasionally vents into a home through the sanitary sewer service line and plumbing ventilation system. When this happens, water in the toilet bowl can bubble or surge or, in rare cases, splash out of the bowl.
Common Causes of Air Venting
- Air movement from normal cleaning operations
- The use of high pressure necessary when cleaning lines within a steep slope
- Sewer lines running close to the building
- Capped roof vent
- Size and complexity of the home’s waste and ventilation system
If you happen to see a sewer cleaning machine on your street, you may want to make sure your toilet lids are down.