One coin is positive, one coin is negative because the 9 volt batter is touching both separately.
One coin will start to burn off or mist into the water.
I have also used it as a gargle to kill a sore throat in seconds. It will kill eye infections, runny nose, thrush and other yesst infections by soaking the infected skin. Also it has killed food poisoning.
This is my personal experience as to what I have used it for. I'm not making it up or making false claims.
I figured if it kills pathogens for humans then it will kill pathogens on plants. So I tried it. It worked perfectly.
