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TDC1000-TDC7200EVM - TOF not changing

Hello,
i bought TDC1000-TDC7200EVM a two days ago and i am trying to measure level of water. The tank is plastic box with sizes W70x L70x H150 mm.
The thickness of walls is 1.5mm and there is no cylinder as this in the clip. Is it necessary to have cylinder in the box over the
ultrasonic? I am using only one sensor(included in EVM package) and it is mounted on the bottom side of the box. The settings are the same as in the clip.
[url]www.youtube.com/watch
The problem is that the result is not changing, where can be the problem?

Best regards,

Peter