The red wire electrode is the active one. Whenever place in water, the germs around it seem to die fairly quickly.
A few years back, I had a nasal procedure performed and shortly afterward developed a severe infection that produce the bright color of Staphylococcus aureus. The doctor prescribed 2 Antibiotics . I believe that 1 was cipro. After 10 days, they failed to produce even the slightest clearing of the infection. At my wits end, I pulled out my trusty MX and used it for a couple of hours. When I woke the next morning, the infection was 95 percent gone. Since it must have helped the Antibiotics , I did it again. I am all better now.