The device anons use to make their CS at home was developed by an engineer fren. He built several dozen units but did not sell them commercially. So I cannot recommend a particular way of making CS. Am aware there are tons of simple, inexpensive devices and techniques such as yours.
Our machine uses a low voltage DC current passing through two .9999 pure silver electrodes for 3.5 hours with a lab stirrer that gently agitates and has the option to automatically alternate the polarity of the electrodes. The goal is nano sized Ag particles and was confirmed by electron microscopy. It peaks out at about 20 parts per million. The concentration and particle size are precise and repeatable.