Does the sodium carbonate need to be made fresh each time I make Colloidal Silver? I’m asking cause I started to make a new jar of Colloidal Silver and my voltage is only around 4 volts. I’m using left over sodium carbonate from a dropper bottle I made. At first I thought it may be my DW, but I got a new jug and I forgot to put sodium carbonate in the water at first and voltage was fine. Few minutes later I remember the sodium carbonate and now the voltage is back around 4. I adjusted silver bars and nothing is having effect on the voltage.