Here is a link with a good explanation of the differences between Zappers and 
Beck Blood Purifier's
http://www.toolsforhealing.com/products/Product_differences.htm

Do You Know the Differences Between a Magnetic Pulse Generator,a Zapper, and 
a Beck Blood Purifier?
Dotsie

by Dennis Harwood

The Hulda Clark Zapper is a small electronic device that uses two copper 
handholds to deliver an electrical current of approximately 7 to 8 volts to 
the body.  This current produces a square wave with a frequency of about 
30KHz (Kilohertz).  There are some units that have frequencies as low as 2KHz 
to 5KHz and some that even have a variable frequency.  The lower frequencies 
are supposed to make it easier for the current to penetrate into the body and 
be more effective.  Regardless of the frequency used, all of the Clark 
Zappers work on the same principle of a DC current with a square wave applied 
to the body through the handholds.  These handholds can be placed on any part 
of the body desired, not just held in each hand.   As a matter of fact, it is 
recommended that you routinely switch the position of the handholds to 
different parts of the body to promote penetration of the current to all 
areas and extremities.The Bob Beck Blood Purifier (Silver Pulser) is also an 
electronic device that uses two small electrodes that are placed over major 
blood supply arteries or veins on the wrists or ankles.  It produces a small 
micro-current in the blood stream as the blood circulates past the 
electrodes.  It uses a higher voltage, typically about 27 volts, but a much 
lower frequency than the Zapper.The Magnetic Pulse Generator does not use 
electrical currents, but instead uses a high intensity, short duration 
magnetic pulse of approximately 21 Kilogauss as its means of killing or 
immobilizing parasites.   The unit consists of a small box which holds the 
electronics and a round coil attached by a cord.  It is the coil which 
produces the pulse every 5-8 seconds.   The coil can be placed anywhere on 
the body, including the head and face.  The ability to place the coil 
anywhere means that areas not covered by the Zapper or the Black Box/Blood 
Purifier are easily treated, including the Lymph system, stomach, head, and 
intestines.All three devices are attempting to do the same thing, i.e. to use 
either small electrical currents or high intensity magnetic pulses applied to 
various areas of the body to kill living organisms that are in your body that 
shouldn't be there.  This includes organisms such as: viruses, bacteria, 
mold, fungi, and parasites, which includes such nasties as tapeworms, 
ringworms, roundworms, flukes, HIV, Flu bugs, etc.  I'll be using the term 
parasite from here on to mean any and all of the previously mentioned 
organisms.  So please keep that in mind while reading the remaining text.The 
number of microscopic and non-microscopic invaders that are in the human body 
on a regular basis is truly astounding!  What's even more astounding, though, 
is the fact that the medical establishment seems to be completely oblivious 
to their presence.  The damage they do, however, is very real and is a major 
source of suffering for an almost completely unsuspecting public.  The World 
Health Organization and other knowledgeable health groups around the world 
have stated that parasite infestation is the number one health problem in the 
world.  Yet your friendly, local doctor is unaware for the most part.  Or it 
may be that he is simply unwilling to waste time trying to convince people of 
the problem.  In the United States we, as a people, seem to believe that 
parasites are only problems for poor people from some third world country.  
We are too clean and civilized to ever have parasite problems.  Think again!  
Read the article In any event, to get back to the task at hand:  How do these 
devices differ and do you need to use all three of them?  In short, they are 
different in major ways and, Yes, you do need to use them all to be more 
effective in eliminating parasites of all types.  The Zapper kills by passing 
an electrical current through the body.  Electricity travels on the surface 
of muscle tissue and will not penetrate the body like radio waves or x-rays 
do.  Therefore, there are large areas of the body that the current cannot 
reach, making it ineffective in eliminating parasites in those locations.  
Areas such as the contents of your stomach and your intestines, your sinus 
cavities, parasites inside gallstones in your gallbladder and/or liver, and 
the blood stream and lymph tend to be impervious to the Zapper.  
Unfortunately, large numbers of parasites live in all of those areas.  So you 
need different devices to reach different areas.The Bob Beck Blood Purifier 
differs from the Zapper in that it's sole intention is to clean the blood 
stream by immobilizing the parasites found there by means of a small 
micro-current applied directly to a blood vein or artery.  It takes 
approximately two hours for the blood of a typical person to completely 
circulate once throughout the body.  So while wearing Bob Beck's Blood 
Purifier unit you are exposing your blood stream to the current about once 
every two hours.The Magnetic Pulse Generator allows you to target specific 
areas on the body, such as the Lymph system, the face, or certain muscle 
groups.  These are all areas which can have little or no exposure to the 
electrical currents of the other two devices.  Because of the short duration 
of the magnetic pulses this device is not effective in cleaning the blood 
like the Blood Purifier(Silver Pulser).Please remember, one treatment won't 
kill or immobilize all parasites in your blood or your body.  You have to do 
repeated sessions to continually work on the parasites that are ever present. 
 And no one can guarantee the elimination of all parasites throughout the 
body, it just isn't possible..  The Zapper works mainly on the muscle tissue 
and surface areas inside the body.  The Blood Purifier works on the blood 
stream.   The Magnetic Pulse Generator is mainly used on the Lymph system and 
areas around the head.  So there is little overlap of the three devices and 
they should all be used for the most effective treatment of any major disease 
or as a preventative treatment.After having said all three should be used, I 
don't want you to get the idea it is all or nothing.  Many people only use 
one or two of the devices.  Let your own judgement, and your financial 
resources, dictate what you do.  If you are ill, don't spend foolishly 
expecting miracle cures.  These devices have been in use around the world for 
many years and anecdotal evidence of their effectiveness abounds, but I'm 
obligated to tell you that no cures are guaranteed or implied.  Testimonials, 
while interesting, are not an indication of scientific or medical 
effectiveness. There seems to be differences in opinions as to which device 
is the most effective in dealing with a variety of illnesses. My personal 
opinion is that it depends on the particular illness involved.  I've read 
reports of the Zapper being not as effective as the Silver Pulser (Blood 
Purifier).  From personal experience with both devices all I can say is I use 
both.  My personal recommendation is to use the Zapper for quick "zaps" on 
children and in any situation where you are looking for a reasonably quick 
resolution to a parasite situation (Colloidal Silver is normally the first 
thing I reach for).  The Zapper won't work in all situations due to the 
nature of the electrical current, but I have found it is very useful in 
dealing with children and their continual exposure to Aflatoxin and Ergot 
mold toxins.  These toxins are in all sorts of foods that are used everyday 
by most kids and can do a real number on their systems, resulting in "temper 
tantrums", abnormal behavior, uncharacteristic outbursts, etc.  Don't let 
your kids eat peanut butter!  Read what Dr. Clark has to say about it in the 
book "The Cure for All Diseases".  Being aware of this and using the Zapper 
regularly has made a difference with my kids, lowering stress levels and 
reducing the "us against them" tensions found in lots and lots of families 
with young children.The FTC (Federal Trade Commission) has questioned my 
claims of beneficial use of these devices.  I claim no cures, and want to 
make sure everyone understands that my opinions are my own and have no 
scientific or medical basis.  In other words, I'm not a doctor and can not 
allow anyone to assume I'm stating things as facts, when they have not been 
proven in medical studies recognized by the medical community.  With that in 
mind, please continue reading my opinions below.An interesting study was 
related to me recently about the Zapper.  A researcher has been using chicken 
legs as a measure of effectiveness of the Zapper in reducing or eliminating 
microbes.  This researcher says it takes about three days for normal fresh 
chicken legs to spoil.  After "zapping" for an hour each day the chicken legs 
will last up to seventeen days before spoiling, depending on the particular 
Zapper being used.  There is a lot of debate about what component of the 
Zapper current actually produces the results.  Most researchers tend to 
believe that it is the odd harmonics produced by a small spike that is 
present in the square wave produced by standard Clark Zappers.  Some of the 
Zappers being sold have had this spike intentionally removed, supposedly 
making the unit work better or reducing possible tingling sensations.  My 
feeling at the moment is the spike is necessary for the most effective 
operation.  Another researcher has stated that different units will produce 
different results, with some being better at certain illnesses than others.  
Be aware of these differences and, for the moment, try to stick to the 
standard Zapper design.I don't have the particulars at the moment, but a 
researcher of the effects of the Beck Blood Purifier units has stated that 
"normal" blood will only last about three days in a test tube before 
"spoiling".  After a full blood purification treatment the same blood will 
last about thirty days!   Major difference, huh?  This info has not been 
verified, so please use your own judgment about the truthfulness.Bob Beck 
recommends using his Blood Purifier for two hours per day for a minimum of 30 
days, and longer if you have a major illness.  Then use it periodically to 
maintain a clean blood stream.   Dr. Beck's other devices, the Magnetic Pulse 
Generator, the Water Ozonator, and Colloidal Silver, are all part of a 
complete protocol developed by Dr. Beck to eliminate all types of parasites 
from all areas of the body.The Magnetic Pulse Generator should be used in 
conjunction with the Blood Purifier for about 20 minutes per day.   What has 
been discovered over years of use with thousands of people worldwide is that 
parasites can "hide" in your Lymph system, appearing to be gone just to 
return months or years later bringing old illnesses with them.  For people 
with major illnesses it is very important to use both devices together for 
complete coverage.A typical use of the Zapper would be initially for daily 
use, a minimum of one to three times per day (of one hour sessions), for one 
to two weeks.  Then periodic use every few days or so to keep clear of 
parasites.   How frequently you use it after the initial one to two week 
treatment depends solely on your individual needs.  Some people can go a week 
or more between Zapper sessions with no problems.   Others tend to feel 
sluggish every three or four days and need to Zap to restore their energy.  
With all of these devices, use common sense and listen to your body.An 
Important Note:Increased publicity about Dr. Hulda Clark and the Zapper has 
brought increased attention from health and government authorities.  This 
website and others are being scrutinized for outrageous or misleading claims 
of cures or  beneficial treatments.  I have chosen to work within the system, 
not to fight it.  There may be an inordinate number of disclaimers on many of 
my pages, but I have no other choice.  I started this website years ago as a 
place for people to go to get information that could be life-saving.  Selling 
products was always a secondary issue, not the primary focus.  Lately, the 
focus seems to be on getting more and more people to use Zappers, Colloidal 
Silver, and Silver Pulsers, to get the info and the products in the hands of 
as many people as possible so there will be no way to stop them.  If enough 
people use and know about these products, and see results, it makes it harder 
for them to be forced off the market.You, the consumer, must be aware of 
these devices, but not tricked or suckered into buying something based on 
unfounded claims.  When sick with a major illness, it is easy to jump on 
anything that might offer relief.  If I were dying, you can bet I would do 
whatever I could to find something that worked. Unfortunately, nothing works 
for everybody!  And there is way too much hype in the health industry, as 
well as in the medical profession and the drug industry.  Any one who says 
otherwise has a vested interest somewhere.In my opinion the information 
provided by Dr. Clark and Dr. Beck is truly life saving.  But, I am not a 
medical doctor and don't pretend to be one.  You have the right to choose the 
medical treatment that suites you, despite what the government, the AMA, and 
the drug companies have to say.  May your journey to good health be 
fruitful.Sincerely,Dennis