re: zapping/zappology. my first post. crawl/walk/run....

Greetings all,
I've just recently discovered this site and I've done some reading in the Zapper Forum . I'm new to all things relating to frequency treatments, zappers, etc etc.
I've purchased my first zapper and I've zapped once. I think I zapped for too long and it's taken me a few days to recover.

Presently I'm spending several hours a day reading past/present threads in the forums trying to educate myself on all things re zappers: frequency, duty, voltage, efficacy, safety, sine waves/square waves, metal absorption, etc etc.

I have so many questions. For now though I pose these two questions:

1.

If “Any positively offset frequency kills all bacteria, viruses and parasites simultaneously, given :
= sufficient voltage (5 to 10 volts),
= duration (seven minutes),
= and frequency (anything from 10Hz to 500kHz.”,
then why does it matter what frequency is used?

2. Some zappers connect into the wall. I have read that this can be dangerous and lead to electrocution if parts fail. If a zapper has a Power Isolation that protects the user from electrocution (and if the zapper is constructed so that if power isolation and related circuit fail, then the adapter is rendered inoperable) does this make the zapper safe to use plugged into the wall (rather than just battery operated.

I will thank you all in advance for your patience etc. As stated, I know virtually nothing about all of this; however, I'm willing to do what it takes to learn.