People here recommend Utopia-Silver generator and Silver Puppy.
I can recommend you to make your own silver generator. On the pictures, the laser beam is not strong because the batteries of laser pointer are exhausted. The other problem is that I used 33k ohms resistor and this slow down the process. With this size of electrodes I had to use 10khoms and the silver solution would be saturated with ions only for 4 hours.