Fixing a toilet that flushes weakly or sluggishly usually requires addressing insufficient water volume in the tank or blocked rim jets. First, remove the tank lid and check the water level; adjust the fill valve float upward so the water reaches the water line mark (about an inch below the overflow tube). Second, inspect the rubber flapper to ensure it stays open long enough during a flush. Third, clean out any mineral scale buildup clogging the rim feed holes underneath the bowl rim using a piece of wire. Verification: Test a complete flush cycle to ensure powerful siphon action.
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