None wrote:
LOL. 6.7 and 6.8 are almost neutral. Most people
would think your water is ideal.

Well, do you have any idea what might cause problems in the supply?
Stuff in the pipes maybe ...bacteria etc?

I haven't heard a problem stated yet. Don't know
what showering is uncomfortable means. Too hot,
eats your skin, causes a rash? Shower stained
with what? Why would a stain be caused by acid,
which the water isn't at 6.8 pH.