A toilet that flushes sluggishly or fails to clear waste completely is usually caused by insufficient water volume in the tank, a partially blocked bowl trapway, or mineral scale buildup clogging the rim feed holes underneath the bowl rim. If the water level in the tank sits too low, the flush lacks the necessary gravitational force to trigger the siphon action. Verification: Adjust the fill valve float upward to increase tank water volume and test a complete flush cycle.
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