If only one side of your double kitchen sink is backing up while the other side drains normally, the blockage is typically isolated to the individual tailpiece, strainer basket, or garbage disposal unit directly beneath that specific basin. Because the obstruction has not yet reached the shared central sanitary tee or P-trap below, wastewater flowing down the opposite side is unaffected and escapes freely. Verification: Inspect the tailpiece and disposal chamber on the clogged side for trapped food waste.
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