This is my previous "deionized" water. I found it hidden somewhere for some reason. Maybe some time ago i started to think this water was .
As you can read, even if its in italian, they call it "Distilled" and below "DEIONIZED".
Now I can understand why my watercooling system its full of gunk and copper oxide everywhere.
This in' "deionized-distilled" water has a pretty acid PH, going out of scale in the PH table.

First time I checked the PH, and it was a bit more greenish, about 6,5 I can say.
After that, I shaked the tank with that water for a while, and the results are the following: