Hi  Roger;

> The pH for cone runs about 5 and for the arc about 6+

How about sending me 2" of #22 Ag and I will try it. Some where I have a draw
plate that I used many years ago in the tropics to make small solder wire, but I
can't find it.

I use the Aquarium Pharmaceuticals test kit #LR1800, and I have made a 
calibration
for my spect. so that I can read to 0.1ppm of NO3.

If you are not measuring your CS for NO3 then send me about an ounce (I need 5 
cc)
and I will check and compare to what I will make.

System Tech Engineering
Robert L. Berger
12303 E. 89th St.
Kansas City, MO 64138-5150

>
>


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