Holes beneath the rim direct water around many toilet bowls. Mineral buildup can change how the water enters the bowl, leaving areas that receive little rinse. A weak flush can also involve tank water level or a restriction downstream.
Watch how water enters the bowl
During normal use, note whether water enters evenly and whether the bowl rises before it clears. Uneven rinse with normal drainage gives the plumber a different starting point from a bowl that remains full.
Check what the toilet manufacturer allows
Share the model and any products already used. Cleaning instructions vary with the finish and design. A plumber can inspect the flush passages and check whether the tank delivers enough water.
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