Re: [APD] GH versus PPM

["S. Hieber" <shieber at yahoo_com>]

I believe any kind of ions in the water will affect the
conductivity. It doesn't have to be calcium or magnesium,
it can be sodium or any of the others that can show up in
an aquarium.

sh
--- Tom Wood <tomwood2 at flash_net> wrote:

> I bought a TDS meter with my new RO system. Input is
> 470ppm and output is 
> about 10ppm. I understand that the TDS meter is just a
> conductivity 
> measuring device with a built-in conversion factor.
> However, my GH test kit 
> is saying that the water is two degrees 'hard' or about
> 38ppm when the TDS 
> meter says it's 220ppm. I've read the posts about GH
> being only 60% of TDS 
> but this is way off. My KH test versus pH test is also
> way off, my fish 
> should be officially dead from CO2 poisoning. I use Kent
> RO Right to get 
> the RO water's TDS ppm to where it is. Something is
> messing with the 
> chemistry in a way that affects the titration (Aquarium
> Pharm.) test kits. 
> Any ideas?
> 
> TW 
> 
> 
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