When the vent stack clogs, your home’s plumbing has an asthma attack. It can’t inhale. So, when a toilet flushes or a sink drains, the rushing water creates that vacuum. With no air to fill the void, the water has no choice but to pull from the nearest available source.
The fix is not in the basement. It is on the roof. vent stack clogged
And then? You run downstairs, flush the toilet, and listen. When the vent stack clogs, your home’s plumbing