When a toilet flushes but solid waste remains behind in the bowl, it indicates insufficient water volume in the tank, a flapper that closes too quickly, or a partial trapway restriction. If the tank water level is set too low, the flush lacks the gravitational force and siphon suction needed to pull heavy waste down the drain pipe. Adjusting the fill valve float upward or clearing mineral scale from the rim jets will usually restore proper single-flush performance. Verification: Test a complete flush cycle after adjusting the water level to ensure powerful waste clearance.
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