Water reduction from overhead tank - Please let me know if there way to detect invisible water leakage

Dear Sir,

 

I have a Over Head Tank of 3000 litres capacity connected to submersible pump (borewell) and also connected

to water level controller.  From the last 6 months it has been found that the water does not stay in the over

head tank overnight (even during NIL usage).  There is no visible leakage near over head tank, water pipes and

bathrooms, kitchen etc.,  Pls let me know if there is any device which can detect about the invisible water leakage.

 

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