http://www.quackwatch.com/01QuackeryRelatedTopics/Cancer/clark.html

I guess Clark died from cancer by relying on the zapper for treatment.

You've got great products and you are a great person and I admire you very much. You have helped me very much over the years. There are some people on these forums who are very much taken over by Conspiracy theories and direct these paranoias at people such as yourself. I hope you don't take it to heart. all the best, P

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Those show plainly that most any zapper can be successful at least some of the time.
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another vague suggestion... ("successful" in this sentence does not mean anything precise)

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I just got tired of the perpetuation of the lie that zappers do not work.
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zappers work well. But the electric wave produced by a zapper is poorly effective (or ineffective) to kill common parasitic worms inside a human body.

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Zappers have helped many thousands of people
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another vague suggestion... ("have helped" in this sentence does not mean anything precise)

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acceptance that what does not work for one person might work very well for another.
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typical argument/excuse from an alternative treatment seller who has no proof that his treatment is effective (for our concern, to kill parasitic worms inside a human body)

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If you used a zapper and did not get good results, that is fine for someone to fairly speak out about and even Dr. Thiel's study points out that not everyone has good results. At the same time, is also points out that for some reason, most participants did have notable improvement.
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another vague suggestion... ("good results" and "notable improvement" in this sentence does not mean anything precise)
I can confirm that i have had good improvements in wasting time and money by buying/using zappers.

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At least twice a year, we send out a newletter giving updates to our customers and at the same time, asking what needs to be done to improve our products
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provide one little proof of an experiment done at home (so no excuse possible) that your zapper manage to kill common parasitic worms inside the human body or in a similar environment. If the experiment and results can be reproduced by others users (the basis of the scientific method) there would be no more contradiciton. (but i bet that you won't provide anything convincing, prove me wrong)

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it is extremely unfair for someone to post an implication that our current products as junk.
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I agree, we should rather describe them as ineffective to kill parasitic worms inside a human body.

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repetitive requests for information that is not legal to be supplied is harassment.
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repetetive posts with unproven claims and vagues suggestions and vagues testimonials, is propaganda, deception, blackhat marketing...

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he would read the letter that was sent to me by the FDA. And then if he is smart, he might even read between the lines.
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another excuse.
Ok you are afraid to do an experiment yourself to demonstrate the effectiveness of your zapper, but you also claim to have sold thousands of your zappers all around the world, and after more than 15 years there is not one convincing proof that your zapper or another zapper/frequency generator manages to kill common parasitic worms inside a human body. Don't you find this a little suspicious ? So the critic is not only for yourself but for all zappers/frequencygenerators sellers. What is your next excuse ?