Theory and practice
Read here another theory, made and experimented by a scientific team following a strict scientific search protocol
Another deep study has been done at Albert Einstein College of Medicine, NY, in 1991, about the effect of micro currents, with a magnitude of 50uA to 150uA, and leaded to a patent (Patent # 5,188,738 ).

You will find the original of this article in this site :
http://www.sharinghealth.com/beckprotocol/whatismt.html
"Research at Albert Einstein College of Medicine in New York in 1991 piqued Bob Beck’s interest in microcurrent therapy. This research involved the application of microcurrents to blood in the lab. The microcurrents neutralized the HIV virus … and other pathogens as well.

The research was first announced to the First International Symposium on Combination Therapies on March 14, 1991.

The research was also reported in the March 30, 1991 issue of Science News:

"William D. Lyman and his colleagues found that exposure to 50 to 100 microamperes of electricity—comparable to that produced by a cardiac pacemaker—reduced the infectivity of the AIDS virus (HIV) by 50 to 95 percent. Their experiments, described March 14 in Washington, D.C., at the First Inter–national Symposium on Combination Therapies, showed that the shocked viruses lost the ability to make an enzyme crucial to their reproduction, and could no longer cause the white cells to clump together—two key signs of virus infection."

The researchers anticipated a microcurrent device would be developed for implant or that a dialysis approach would be used with microcurrents applied as blood was circulated outside of the body. William Lyman was also interviewed on Quirks and Quarks, a Canadian network radio program on March 30, 1991 about their promising research. Despite the fact they had found an inexpensive way to cleanse blood, their research was dropped. US Patent #5,188,738 filed in 1993 stands as a sole source for evidence of their research. Such is the politics of health at present."


Inspired by this research, a genial innovator, Mr Bob Beck, made out a very simple device, based on micro-currents : Bob Beck's zapper.

This study done at Albert Einstein College, could be the only useful milestone to explain the action of the Hulda Clark's zapper, to a scientific and medical level.
These two zappers are much more similar than many people could think.

From this study, I conclude that it is the electronic current and the quantity of electric charges at destination who makes the zapper work.  I conclude too that a flow of current of 50uA to 150uA is what it is needed for an optimum effect.  No more, no less.

A real shame for the followers of the "Bigger is Better!"
The assumptions, theories and opinions expressed herein are based on published work of Dr. Hulda Clark and other researchers. 

Some deduction and actual findings are the result of my personal experience with zappers  and the result of my own deduction and “good sense”. 

Feel free to agree or disagree with them.

In this page :

The ionization theory

The micro-current theory
You can read many different theories to explain the results of the zapper, and yet, none had been proven as fully accurate or definitive. The zapper works "as if" it was killing parasites living in our bodies.
They really do so? Do I need to know?

I feel better afterwards than before. That’s enough for me. Well, almost ...

To satisfy your curiosity, here are my findings and my personal beliefs (Again, feel free to agree or not, the debate is still open).

Let resume how the zapper works :
= Powered by a 9V battery (Direct Current)
= Frequency used : Between about 10Hz and 500kHz
= Polarity : ALWAYS positive
= Application: 3x7 minutes with breaks of 20 minutes, or 20 to 30 minutes (or more), without pause.


My conclusions are :
= The frequency seems a secondary point (10 to 500000 Hz is a very wide band).
= The length of time seems important.
= The "electrical pressure" of application (voltage) seems important, but quickly becomes uncomfortable if pushed too far.  Direct current seems a "most" condition.
= So far, I have not found a striking effect on the 0.25V Offset, but given the emphasis that Dr. Clark met on this point, I scrupulously respect her opinion.
= The effect of Dr. Clark’s zapper seems to be very general, and gives interesting results on virtually anything, without any adverse effect other than elimination problems (I think this shows that the body effectively eliminates "something" undesirable for him).

From this I conclude that micro-current (in small quantities to destination) and the period of application, fall primarily into the equation of "how it works" and that frequency is an important, but secondary point.
It is hard to avoid, in this same page, this Mr. Don Croft citation :

"THE ARK WAS BUILT BY AMATEURS, THE TITANIC BY EXPERTS"

As long as the scientific community will not pay attention to the zapper effect and do serious research about-it, the mystery of its operation will be reduced to assumptions not scientifically confirmed.

Please, note that the exact origin of electricity and magnetism is not scientifically proved neither, but this do not stop actual world to empirically use electric motors...

With the same meaning, the origin of life remains a mystery, which does not prevent non-scientific people to make beautiful babies.

According to Mr Croft (Truncated citation.  Please, read the full information in this site: 
Http://www.worldwithoutparasites.org/pararep.htm

“HOW DOES IT WORK?
All parasites and diseased tissues are positively charged.  The zapper introduces negative ions through the skin and into the body's living tissue, killing the parasites by reversing their polarity and also helping to heal the diseased tissue.  Healthy tissue is negatively charged.
… …
Many researches have discovered by different paths that very weak electric current eliminates parasites. 
… …
They can't defend their positive polarity (shortage of electrons) against the introduction of simple direct current, however, and they die very quickly in its presence (the worms in the picture on my website were freshly killed in the colon after a few minutes of zapping during a colon irrigation).  Negative ions kill parasites whether they are from electric current, ozone, or magnets.  The zapper seems to me to be the most efficient delivery method for now.

Parasites not only die when subjected to electricity, but disintegrate and are easily eliminated or assimilated as harmless nutrients.  In fact, since they got most of the benefit from all the expensive supplements that you've been eating all these years, this could be your big nutritional payoff.

Viruses and fungi inside the cells, parasites in cysts, parasites with exoskeletons (like hookworms in the peripheral tissues), etc., will take longer to kill, but clearing the blood and lymphatic fluids, major organ ducts, intestinal and stomach lining, brain and central nervous system, of parasites early on will give your immune system a tremendous, immediate boost and when the hidden parasites come out  of cysts and protected areas they are in for an unpleasant surprise.”


For security reasons, certain organs such as the brain and (especially) the heart, take precedence over the rest of the body, with regard to the current passing through them.
The ionization theory
The micro-current theory
 
 
ZapperWise
 
Applied Electronic to Well-Being
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Legal disclaimer :
We do not prescribe, diagnose, or make any medical claim or advices.
The principles, assumptions or theories exposed here have no medical or scientific value officially recognized.
Please note that Dr Clark’s  books or devices have not been evaluated by Health Canada (Canada) or Food and Drugs Administration (USA), and then, have not received any guarantee on their effectiveness or their safety.
Zappers can only be sold or used as experimental devices for educational research.  They are not intended for use in the cure, treatment, prevention, diagnostic of any disease.
If illness is an issue, please consult a licensed health professional before attempting any self health program.
By using this information without the approval of a licensed health professional, you are prescribing for yourself, as permitted by law, and you take full responsibility for the results.
These results may vary depending on individuals
Certain Internet sites associate zapper and serious illness.
It is not our role to make such assertions. 
Illness does not interest us.
We leave it to the experts of the unhealthy states.
We are only interested to feel better, which is highly subjective, and to get rid of as much “invaders” who drain our resources, as possible.
These invaders, who live at our expense, we name them under the generic name of “parasites”.
We experience the influence of the zapper effect
on these parasites, on a hypothetical and empirical basis, which have nothing to do with medical or scientific rules.