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Re: [APD] GH vs. PPM

RM: "I can't comment on your KH/pH problem because you didn't describe it."

Low KH and low pH indicating extremely high CO2. I'm ignoring the tests for 

RM: "With all due respect to the manufacturers, it is a waste of money to 
use a chemical product to reconstitute RO water unless your tap water is 
*really* out of whack.  Just mix your RO back into your unsoftened tap 
water to get what you want."

Yeah, I thought about doing that but I think this water is *really* out of 
whack. It stinks of bleach, comes from the same groundwater source that 
feeds dead (no plant life) surface waterways, and is problematic to use 
because of the whole-house salt-based water softener. My only real concern 
is determining how low I can go on the TDS with goldfish in the tank. I 
took it down to 170ppm last night by dribbling in RO water for a few hours 
and they still seem fine.

RM: "If there's really something messing with the results of your 
titrations then it is most likely to be either the quality of the test kit 
or an inattention to detail offered by the analyst."

Heh, that is the most polite version of "user error" that I've heard. Thank 
you for that, but I -think- I'm doing it right...


> 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 
> meter says it's 220ppm. I've read the posts about GH being only 60% of 
> 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? 

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