What is the best voltage and current to generate 10-15ppm silver? I will be using a homebuilt variable voltage/current power supply, homebuilt magnetic stirrer, 500ml steam distilled water, 1.5mm 99.99% silver rods. I want to make sure the the ppm level is as close as possible I know I can use the Faraday's Equation Calculator but I am unsure on the accuracy of this, do folk recommend a TDS meter? if so how accurate are these meters?