Water coming out of the bathtub overflow drain during a normal bath or shower indicates that the water level inside the tub basin has risen above the height of the overflow pipe inlet, which is functioning exactly as designed to prevent flooding. However, if water pours out of the overflow while you are simply running the shower and the tub basin is empty, it points to a severe blockage in the P-trap or main drain line forcing wastewater backward up the overflow tube. Verification: Check whether the main drain is clogged and clear any trapped hair restrictions.
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