If a toilet appears to execute a secondary flush or double-flush action immediately after a normal flush, it is usually caused by residual water sloshing back over the weir or an improperly adjusted flapper chain. If the flapper stays open too long or if a second wave of water drains from the tank due to a slow fill valve, it creates a delayed secondary surge. Verification: Inspect the internal flapper and chain movement during a test flush to ensure the flapper drops cleanly once the tank empties.
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