Re: I agree with what you explained but that was not what i meant.

>- most zappers are useless against big parasites.

Agreed - Most ...

>- I have tried several zappers

Yes, I have too and I do agree that there are limitations to zappers but some are better at somethings than others.

>- concerning big parasites like roundworms and filarial worms, they are useless

This may be the case for the zappers that you have used but not necessarily for all.

>- I have tried this, in several ways, ... the skin can be and will be damaged.

Your electrodes are probably way too small and you possibly may not be using a strong enough salt water solution for good conductivity.

>- Your zapper seems really weak

How can you claim weak when it produces more current than the other zappers that you mentioned? 10.0 ma is considered a safety threshold, 20.0 ma is considered potentially deadly.

>- i would need

Are you using a strong salt water?

>- Have you measured the intensity going through the body when a person use your zapper with wet electrodes ?

Actually measured. Did a group of 7 volunteers, got minimums, maximums, averages, etc.

>- A theory ?

No, actual mathematics that can be proven. It is called Ohm's law.

>- What kind of electrodes do you use ?

We use copper because it is safer and is a better conductor. The pads are 9-1/2 inches long by 3-1/2 to 4-1/2 inches wide ( trapezoidal ).
Copper pipes are 3/4 dia by 4-1/2 inches long.