I question whether it is beneficial to have a current limiting circuit. The resistance of the colloidal silver solution does vary to some extent, and as a result, the current flowing through it varies. But this is probably not a problem. The current or voltage change could actually be used to determine when a batch is finished.
JAB
If you want to go as high as 20 ppm you will have to have a current limiting circuit. Unless you want to use a huge resistor that will take forever (in the begnning when the water has high resistance). If you go over 5 ppm you will have large particles unless you have some type of current limiting circuit.
And a resistor is a crude current limiting circuit.
fetched in 0.0313 sec, IP =18.191.152.135, y=1