Hi Andreas:
What is the conductance tester you are using? I only have experience
with a PWT (which is designed to test pure water).
It really shouldn't be off the chart. Any PWT or TDS meter should be
able to read close to 1000 PPM.
FYI: Rinsing with distilled water won't remove any actual residue in
the glass container.
To ensure total cleanliness:
1. Use a bit of 3% H2O2 in teh glass container, and wipe down
thoroughly with a clean white paper towel. Leave a tiny amount of H2O2
in place for a few minutes before drying.
2. Rinse with distilled water
3. Dry with a clean white paper towel.
4. If you're a stickler for details, rinse once more with a tiny amount
of distilled water (to remove any tiny fibers from the paper towel).
I never use any type of soap product in any container I plan on brewing
CS in.
There are alot of contaminants that may not affect conductivity.
However, distilled water is regulated, and while I don't agree with the
current standards, contamination shouldn't be a great issue.
~Jason
On 6/4/2013 10:58 AM, Andreas Hahn wrote:
Hi Jason,
Thanks for the fast reply. Since the bottle of store bought stuff says
"not for drinking," are there any unhealthy contaminants that would
still pass the conductivity test?
The brewed CS is too conductive for my conductance tester, using an
ohmmeter produces a resistance of around 40k ohms. I did wash out the
glass in question thoroughly and then rinsed it with distilled water
before brewing, so there's little chance of anything substantial having
stayed behind on the glass.
On Tue, 4 Jun 2013, Jason wrote:
Hi Andreas:
A PWT reading of 0.5 uS is great... perfect for making CS.
You can also check the pH (although I'm usually dissapointed with
store bought water pH) if you're worried about the quality.
The distilled water that I make at home is 0.3 uS, pH ~7.0.
I think that most of the commercial steam distillers must leave their
production vessels open to air, as it usually tests acidic. However,
CO2 doesn't seem to really affect the production process, unless high
voltage is used (which pulls nitrogen from the air into the water,
also making the end product acidic).
Most home brew production setups result in some oxidized silver
residue settling on the bottom of the container.
Test the conductivity of your final brew to be certain that your
container didn't have some residue, and then use a laser light to look
for particulate silver (and see how many, if any, large particles of
silver are in the brew).
It's not a perfect science, but with practice you'll be able to tell a
fantastic batch of CS in comparison to a mediocre (or bad) batch.
Kind Regards,
Jason
On 6/4/2013 10:23 AM, Andreas Hahn wrote:
Hi,
I would like to use store-bought distilled water for making CS. Testing
with a conductance meter reveals very low conductance (0.5
microsiemens). Is there any other thing to check?
I made about 200ml CS in a glass with it and it produced a brownish
particulate residue that settled to the bottom. I'm not experienced with
making CS, so I don't know whether this is normal or indicative of bad
water.
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