Adding more water to a blocked system will only increase the pressure and the amount of sewage that backs up into your home. 3. How to Unclog the Main Line: 3 Common Methods A. The Sewer Auger (Plumbing Snake)
After clearing the clog, run hot water through your drains to ensure they're flowing freely.
You might be tempted to pour a gallon of harsh chemical cleaner down the drain.