I don't know any more specifics about the water except that the spring water is supposed to be natural so contains no chlorine. It probably has some natural minerals in it. Here is an example of a label about mineral content from bottled spring water:
INGREDIENTS
NATURAL SPRING WATER. DISSOLVED MINERAL SALTS: 180 PARTS PER MILLION. FLUORIDE IONS: 0.1 PARTS PER MILLION
I understand that electrolysis requires 1.47V minimum to start, so this is why I'm uncertain what to make of the meter reading. There is obviously some kind of residual charge, but I don't know how to quantify it.
I was also using a self resonating radiant charging circuit to do this, not the Stan Meyer circuit. The time period it was running I'm not certain about, but you do see the one pipe has white oxides on it. Might have been several hours.
The cool thing about this however is I believe it suggests that the water is indeed polarized.