sensitivity for water flow sensor

How to overcome sensitivity issue of water flow sensor while interfacing with aurdino

If it's too sensitive, be more gentle to your sensor. If it's too insensitive, have a stern talk with it.

If that doesn't work, get a sensor with the sensitivity your application needs.

How to overcome sensitivity issue

What might that "issue" be?

OP's not having much luck with sensors from bigelectronics, it seems.

Perhaps it's time to change vendors :wink:

I have more the feeling that the OP has no clue of what they're doing, let alone how to ask a question properly.