Monday, March 20, 2017

Graham Stetzer filters for Electromagnetic Hypersensitivity

People occasionally ask whether Graham Stetzer filters are beneficial for people with Electromagnetic Hypersensitivity.
The company website explains what the filters do:
"The STETZERIZER filter is designed to filter harmonics and other high frequency current (trash) from the electrical environment, thereby reducing the potential for leakage into the human environment and creating additional trash in non-liner loads (televisions, computers, variable frequency drives, energy-efficient lighting, etc.)."[1]
However, Richard Conrad wrote an article called "EMF SCAMS PROVIDE A DANGEROUS FALSE SENSE OF SECURITY," in which Graham Stetzer filters are listed as the third EMF scam on the list.[2] And states, "a capacitor filter, by whatever name, will not make your electricity cleaner, but dirtier."[3]
I tried Graham Stetzer filters a few years ago and they made my EHS symptoms a lot worse. And my symptoms immediately got a lot better after unplugging them a few days later. So, I wouldn't recommend them to anyone with EHS. My experience seems to be supported by the article at this source[4]:
"We conclude the following:
1) The Stetzer filter draws 0.9 amperes of reactive current on its own therefore increasing the amount of current supplied to the home, increasing the burden on the electricity supply and increasing ambient magnetic field levels in the house. The amount of increase may be large or small depending on the number of filters installed.
2) The Stetzer filter does not clean up line voltage harmonics. Nor does it help to restore the current of a non-linear load back to a sinusoidal shape. The Stetzer filter current is highly distorted containing harmonic content up to 10 kHz. (Stetzer current harmonics are accentuated versions of the line voltage harmonics.) Since Stetzer filter currents add vectorily to the other load currents in the home, their distortion products (harmonics) are carried on the electricity supply and add to the level of “dirty electricity” in the house.
3) The Stetzer filter is probably effective in attenuating high frequency (4kHz to 100 kHz) noise on the AC power lines although these components are small to begin with. No assessment can be made concerning its effectiveness in suppressing transient disturbances since these phenomena are random, infrequent events for which we are unable to test."[4]
The following two links provide support for the effectiveness of GS filters but I am skeptical of them because of the reasons given above:

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