When a toilet fails to flush properly despite having strong household water pressure, the issue is internal to the toilet tank or bowl rather than your supply lines. Common causes include a disconnected, broken, or improperly adjusted flapper chain that prevents the flapper from opening fully, a clogged or blocked rim feed hole and siphon jet preventing water from entering the bowl quickly, or an obstruction trapped inside the toilet trapway. Verification: Remove the tank lid to inspect the flapper chain slack and check the bowl for physical blockages with a toilet plunger.
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