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Flush the toilet. Does water come up in the tub or shower? If yes → main line clog.
Look for a white or black cap in your yard, basement, or garage. Open it (carefully!) and snake from there. how to unclog sewer line from toilet
Here’s how to tackle it step-by-step:
If multiple drains are backing up (sinks, tub, toilet) or your toilet gurgles when you flush the shower—it’s likely a , not just the toilet. Flush the toilet
Attach to a garden hose, insert into the cleanout, turn water ON. The bladder expands and blasts the clog forward. insert into the cleanout
You need a 3/4” or larger sewer auger . Feed it through the toilet drain or a cleanout.