Hey, the zapperplans one works pretty good. I was testing with a lower frequency but running a test doesn't mean I accept their theory yet. I tried the 2300 Hz one, it works like a zapper should, then I tried the 23,000 Hz one and it works too like a zapper should. Maybe I'll try them on some animals or pets later, see if I can detect a difference. Also there might be something to what the guy was saying about copper handles and foot pads, using salt water contact, and zapping more than 3 sessions. However Hulda Clark cautions against zapping over 10 minutes. Anyway you can try all that out on a low-cost $10 zapper. If you do zap more than the recommended amount you may wish to take some probiotic cultures like kombucha tea, kefir, or yogurt.