We have found that the Crystal Brand of distilled water is better than others.  
The others didn't
make as good of CS.

 
> Date: Tue, 4 Jun 2013 19:58:49 +0200
> From: andreas.h...@laposte.net
> To: silver-list@eskimo.com
> Subject: Re: CS>Checking distilled water quality
> 
> 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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