A phantom flush typically sounds like a sudden, brief burst of rushing water or a quiet hissing refilling sound occurring unexpectedly every few minutes or hours when no one is using the bathroom. It sounds exactly like the final few seconds of a normal toilet refill cycle, as the fill valve kicks on briefly to restore the water level in the tank after water has silently leaked past a worn flapper into the bowl. Verification: Listen closely to the tank during a quiet period to detect intermittent refilling sounds.
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