Filter Characteristics

• 2 in. x 2 in. x 4 in.

• Encased in an off-white plastic covering that fits naturally with home or office decor

• Fits into a normal home or office electrical plug

• Certified by Underwriters Laboratories and the Canadian Standards Association as safe for home and office use.

Product Overview

What is Dirty Electricity?

The area of electrical pollution and power quality is inherently complex and multifaceted. For many, it is a challenge to understand what information is fundamental and what is incidental. This is further exacerbated by the common use of misleading terminology such as "stray voltage", and the misinformation by those working to marginalize and delegitimize the concept of electrical pollution.

The fact is electrical pollution is real as are its associated health effects. Similarly, the beneficial effects of the Graham-Stetzer Electric filter (the filter) are genuine, just as the readings of the Graham-Stetzer meter (the GS meter) are appropriate for measuring electrical pollution. The purpose of this document is to compile a simple, integrated, quantified reference that provides an understanding for those interested in how the filter and meter work.

The filter is based upon 100 year-old electromagnetic theory and 50 year-old power engineering principles. These proven concepts and the associated technology have been redesigned and reapplied to help reduce home and office electrical pollution.

Essentially, the filters provide a low impedance path for high frequency currents from the hot wire(s) to the neutral wire return path bypassing the customer loads. The optimal filter frequency range is from 4 kHz to 100 kHz, while there is decreasing filtering action above 100 kHz and below 4 kHz.

Direct current (dc) is like a battery where current flows between the terminals. Alternating current (ac) is wave-like and oscillates back and forth, though the energy flows in the direction of the load. Frequency refers to the rate of oscillation. The base unpolluted grid current oscillates at 60 times per second (defined as 60 Hz), while communications oscillates at a very fast rate, typically millions of times per second or Hz.

Measuring Electrical Pollution
Defining and measuring harmful electrical pollution is analogous to defining and measuring harmful drinking water. It is not the water that is harmful, it's what comes with the water. Similarly it is not (in general) the 60 Hz electric power, it is what comes with the 60 Hz power that is the problem.

Quite simply, pollution is the problem.

To extend this comparison further, just as a water meter is not an appropriate instrument to measure water pollution, normal (averaging or RMS) meters are not appropriate instruments to measure electrical pollution. There is a subtle but fundamental difference between measuring the volume of polluted water or polluted electricity and measuring the amount of pollution present.

While most electrical meters measure the amount of polluted electrical energy; the GS meter measures the amount of harmful electrical pollution.

A human or animal is perhaps the most appropriate 'meter' to measure how harmful the levels of electrical pollution are. A balance of empirical evidence and theory shows that electric current enters the body more readily at higher frequencies, while current through the body (body current) is increasingly harmful at these higher frequencies.

The GS meter displays this by measuring the sum of the voltages for frequencies above (but not including) 60 Hz, weighing the higher frequencies to reflect their greater impact on humans and animals.

The GS meter measures electrical pollution on home and office power lines. This pollution may be caused by internal factors within these environments by, for example, electronic equipment that often distorts the 60 Hz power wave when creating dc power from the ac power. A distorted 60 Hz power wave is a normal 60 Hz wave polluted by the presence of higher frequency voltages and currents (often multiples of harmonics of 60 Hz.). Energy is conserved when transforming ac to dc (with minimal transformation losses), but some of the original 60 Hz energy is also transformed to higher frequency energy that flows back onto the ac conductors.

Pollution may come from a neighbor's or even the utility’s own load. The utility delivers this pollution to your home.

For example, if you share a transformer with another home and their computer creates high frequency distortion, as most computers do, these high frequency currents may find it easier to flow into your home rather than flow through the transformer and on to the substation.

In general, utility companies have not protected pollution sensitive customers from the “downstream effects” of pollution-creating customers.

There are many references on the harmful impact of electricity on health. Books by Robert O. Becker and J. Patrick Reilly, to name two prominent authors. As well, recent papers by Dr. Magda Havas reveal the health benefits of installing the filters, and includes references to those who suffer from diabetes, chronic fatigue, attention deficit, for example.

To learn more, go to the Research Page

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