Already on 2nd one , dad and my diet is almost same , excepts he occasionally eats Boiled Black chana/ sometimes with tadka like salt, onion, chilli. And the bad habit is he drinks a lot, sometimes 2-3 times a day for week.
Cant compare with RO. I had used a UV water purifier (which also had two additional inline filters) before, but my hair still fell when I moved here. The purifier was fed with BMC water. I tested the BMC water based at a lab and the results were perfect, but still, suing the filter somehow fixed my problem. A sample of one (family) isn't statistically significant though.
BMC water is definitely good and it is not hard water at all.
No disagreements on paper, but the government mandated tests that I could find easily do exclude many elements, including heavy metals. I tried the filter out, and since it somehow worked, I didn't have to test for heavy metals.