Testing Keg Holding Presuure

I've started filling empty kegs with CO2 and then attaching a pressure regulator to monitor pressure. I let the keg sit for a few days to see if the pressure drops. That way I don't have a leaky keg when it's full of fresh beer. I was thinking of trying this with the kegs full of water as a way of decreasing the amount of CO2 used for testing.

Any Comments ?

Cheers !!!

Marco Olivo,
Berthoud, Colorado

The water will work but, realize the pressure will go down as the water absorbs some CO2.