List,
Several times I have wondered about making EIS using tap water, not
that I need to do it -- I can get distilled water easily -- but because
I can imagine needing to do so while traveling or in some emergency
situation.
Just playing around, here is some information I came up with:
Making EIS using plain tap water and an old Robey device (uncontrolled
current, auto shutoff), I set the device at the highest setting of 80
ppm. The setting has little correspondence with measured results
(provided by Ode or Marshall long ago), but I wanted to make sludge, so
I set it at 80.
Very visible clouds of gray silver compounds come off the silver bar.
(Cathode?) The other electrode is stainless steel.
The silver compounds flow to the bottom of the jar, then rise to create
a very cloudy, gray brew. However. . . .
Letting the jar sit for 24 hours, I found that the compounds -- silver
salts I understand -- not only fall to the bottom, but soon form a hard
crust there, making decanting a simple matter.
The decanted product exhibits a moderate TE, with only a few
"sparklies." In appearance and taste, it is not dissimilar to a
quality EIS made by an SG6 using distilled water.
I did not check using a PWT meter as the batteries are dead.
I have no equipment or training to conduct more elaborate tests to
determine what might remain in the water as non-silver ions. Experts
on the list might know.
My idea was just to see what would happen, and how much benefit there
would be in letting this inherently inferior product sit on a shelf for
a while. My hunch is that you can come up with a reasonably safe
product.
If so, the smart move while traveling without access to distilled
water, would be to make up some EIS using tap water as soon as you can,
then put it aside for as long as you can.
I stand ready to be informed otherwise by those with a background in
physical chemistry.
Hope this is useful to someone someday.
JBB
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