Buy a couple of Current Limiting Diodes (CLD) 400uA to 1000uA from mouser electronics. Add 4 9V batteries + 99.99% silver wire and you have your own Colloidal Silver generator. Don't forget distilled water!! The silver is what is going to cost. The diodes go for 10 for $4.00 last time I bought. Ask any question you need to, been making and using CS for over 15 years.