I just checked the pH of the water from grocery store refill station: ~ 5.5 ==> pretty acidic, right?
I also checked the pH of the tap water in my house: between 5.5 and 6.0 ==> my tap water is slightly less acidic!!
This is disturbing!! Truly pure water should have pH around 7.0, right? So why filtered water is more acidic? May be because it has less minerals. But the elements that makes it acidic is still in the water. What are these elements?