[APD] GH versus PPM

["Tom Wood" <tomwood2 at flash_net>]

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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