> For truly freshwater tanks, TDS or conductivity is much more useful
> measurement. Mine run from 120 ppm TDS up to over 1000 ppm. Tap water is
235
>
> ppm. I add rain water to make it lower and specific salts to make it
higher.
>
Yeah, I know that but since a lot of us add salt in one form or another it
often builds up. Since I only have a hygrometer I was looking for info I
could I could compare directly with mine.
Moon
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