A small refill tube directs some water toward the toilet bowl as the tank fills. If the tube comes loose or is placed incorrectly, the bowl may end up with less water than usual after a flush. The tank can still reach its normal level.
Compare the bowl and tank levels
Note whether the bowl is low immediately after a flush or drops gradually while nobody uses the toilet. If you can safely lift the lid, look for a loose tube and set the lid on a stable surface. Avoid pushing the tube down inside the overflow pipe.
Show the plumber the arrangement
Share a photo of the fill valve, tube, and overflow opening. The technician can check the clip and routing against the valve instructions and consider whether the bowl is losing water for another reason.
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