I do not have any method of checking the ppm of my CS. In the beginning I did the highest setting but silver particles would develop and I would strain the mixture. Now I use a setting that is 3/4 high. Good results.
I may try the medium setting for the next batch. Thanks for the tip and the tips about the clear jars.
With so many uses for the CS, my machine is well worth the cost. I also like the ease of use. Screw the jar on, turn it to on and go about you business for a few hours.