Why Both Sides Back Up: Double Sink Drain Issues
A double-basin sink that backs up on both sides at once is a strong clue that the plumbing system serving the two drains isn’t behaving like two separate lines. In many homes, the drains connect into a shared section of pipe, and a single obstruction (or venting problem) can quickly affect both basins.
What “backing up together” usually means
When one side fills and the other rises simultaneously, the backup path is typically common to both fixtures. That usually happens because the double sink empties into a shared horizontal run, a common trap area, or a single downstream connection to the main drain. Instead of a localized blockage limited to one basin, air and water can’t move properly through the shared portion of the system.
Common causes to check first
1) Shared clog in the commo ... Read more »
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