If a toilet flush is sluggish and fails to clear waste completely, the issue 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 and siphon suction to pull waste down the drain pipe effectively. Verification: Adjust the fill valve float upward to increase tank water volume and test a complete flush cycle.
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