Please tell me how the work is to be progressed. I already called a few plumbers and all of them said no leaking without appropriate checking or no checking. One of them checked the water pressure as I requested. He used small gauge to attach to shower pipes one by one, then the meter did not move, therefore, he said it doesn’t leak.
One day I went to plumbing supply shop and one staff said that small gauge does not detect the leaks and we should use special equipment (water in bucket and compress air in pipes, then check meter).
I would like to know proper way to investigate for this problem before I call promber this time.