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How to let an alert pop up when a value exceed the maximum

I would like to know how I can let an alert pop up when a value exceeds the maximum. 

 

Here is an example: 

When someone exceeds the maximum of 1500 ml water a day, then an alert should pop up which makes someone aware of the fact that he/she drank too much and that he/she should contact a specialist. How can I integrate this? 

Thank you in advance! 

 

Kind regards, 

Simone

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