With low-voltage devices, it takes time to produce silver colloid with the finest possible grain. The faster the process runs, the greater the current flow must be, the larger the grain and the worse the effect of the colloid. We recommend only small currents for the highest quality colloids.
Conversely, the water conductivity must be high for a high current flow. This means that additives are needed in the water for a short process time to increase the water conductivity.
These devices normally work with tap water. It is therefore not known what substances are in the water that can combine with silver during the colloid process. For quality reasons and for your safety, we recommend using only demineralized or distilled water.
However, there is another aspect to this consideration. Suppose you are on vacation in a country where silver colloid would be very important for hygiene, but there is no pure water to be found. In this case, silver colloid made with tap water is better than nothing. For this reason, a special program has been added to the new SilverHandy models M22, M102 and M104. This means that silver colloid can also be produced with tap water. However, this should only be done in emergencies. With this setting, it is not possible to predict how much silver will be dissolved in the water and how good the quality will be.