Our colloidal silver generators consistently produce particles between .0006 and .005 microns in size. See our electron microscopy photographs for proof. Constant voltage generators are rudimentary and you will probably be unhappy with the device in the long run. They just aren't much good. The problem is this.
Distilled water is a fairly good insulator.
With a constant voltage connected to silver electrodes in distilled water, the initial current flow is very low because the water has high resistance to electron flow. However, as the silver particles finally do start to accumulate in the water, the resistance in the water goes down from the conductive silver content now building up. As more silver is torn from the electrodes, the process is accelerated until one has to stop the process because the particles become so large they begin to fall out of suspension. If the particles of silver are truly colloidal, they will be suspended in the water because they are not heavy enough to sink to the bottom of the vessel and they are electrically charged and repel each other. Larger particles are too heavy to remain suspended, so they fall to the bottom of the vessel.