Decipher My Water Report?

[Roberta]

Except when I fertilize, even my RO water isn't ph6, more like 7. (MSU fertilizer take it down to 6-6.5) For most plants (including most of my yard, which gets city water) my pH is stubbornly about 7.8 (that's where calcium bicabonate puts it, I have lots) Doesn't seem to do any harm. (Before I got the RO system, when I was also fertilizing with tap water, I got the pH down to 6.5 with vinegar just to facilitate absorption of nutrients. Did I say "stubborn"?)