A sewer jetter is a heavy duty lightweight hose that attaches to a pressure washer to unclog: Main Drains Landscaping drains Sewer lines The sewer jetter hose can be fed into the main sewer line that is usually located outside of a home or office. There can also be other sewer lines available for cleanout inside the home or office, and most are often located in the basement. When you turn the pressure washer on, the back-firing jets on the sewer jetter nozzle will pull the hose into the drain for you. So it requires less physical effort on your part than if you were to use an alternative method of cleaning the drain. For example, if you were to use a mechanical drain cleaner. Once your sewer jetter is ready to go, it will scour through any stubborn debris inside the sewer line. As the water travels deeper into the line, it efficiently sweeps through anything in its path.