None of the guys around my place (at least 5/7 kms) have that water tank facility to check the punctures. They have some solution (like soap water) which they add in the water and apply all over the tyre. They did the same thing on my scooter tyre and result was negative. I have asked them how we can be sure that this kind of checking is 100% accurate. He then applied the same solution to another tyre which was given for puncture work and seen that big big bubbles comes out of the area where there was tiny hole in that tyre. And I know this guy for many years and very expert in tyre related works .
I avoid this soap solution method, only in an emergency, I try it.
It's a headache but worth it.