When a toilet flushes but solid waste and wastewater subsequently back up and rise back into the bowl, it indicates a partial blockage or restriction in the main sewer drain line or toilet trapway. While the initial volume of flush water forces some waste past a tight restriction, the downstream pipe bottleneck prevents complete drainage, causing the wastewater to rebound into the bowl. Callout type="warning" title="Hygiene Warning": Wear rubber gloves and eye protection when handling backed-up bowls. Verification: Use a heavy-duty flange plunger or toilet auger to clear the partial restriction and test a bucket flush.
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