A toilet that refuses to flush normally but drains water away very slowly is experiencing a partial blockage or restriction in the trapway or main drain line. This is typically caused by a buildup of toilet paper, sanitary items, or foreign objects stuck in the S-bend siphon curve. Because the obstruction allows water to trickle through slowly rather than forming a proper siphon, waste fails to clear. Callout type="warning" title="Hygiene Warning": Wear rubber gloves and eye protection when unclogging backed-up toilets. Verification: Use a heavy-duty flange plunger to clear the partial restriction and restore rapid drainage.
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