I had done this experiment with my RDWC and it works well. I got this idea from Dr. Beck's zapper. Done some reading articles about how much DC apply to the plants in res. I'm using an old 2V 100mA transformer, twice a day each time 1-3 minutes. After slime was gone then every 1 min / 3 days. Remember do not using high voltage or amperage transformer it will shock the heck out of your roots. Good luck with the experiment.