Stetzerizer Filter


The STETZERiZER® Filter is based upon 100 year-old science and power engineering principles. Newly introduced is the design, which is focused on the needs of the customers in homes, offices, schools, etc. Filters have been extensively applied for decades by industrial users and the electric utility industry itself. The STETZERiZER® Filter is designed to filter harmonics and other high frequency electrical pollution (“dirty electricity”) from the electrical environment, thereby reducing the potential for leakage into the human environment and damage to other electronic equipment (televisions, computers, variable frequency drives, energy-efficient lighting, etc).

SKU: GS-F110-A Category:


System Overview

The STETZERiZER® Filter is based on 100 year-old electromagnetic theory redesigned and engineered for a modern application. Much like we protect our electronic equipment with surge suppressors, STETZERiZER® Filters are designed to reduce the amplitude of microsurges on indoor wiring, proving most effective within the frequency range of 2 to 150 kilohertz (kHz). By reducing the intensity of these high frequency microsurges the filters effectively diminish the amount of electrical pollution ("dirty electricity") in your environment, and hence, the most harmful type of electrical frequencies.

The STETZERiZER® Filter fits into a normal home or office electrical outlet, and is a UL (Underwriters' Laboratories) Listed electrical device. This unique product can be safely installed by anyone, and thanks to its straightforward design and functionality, has an extensive lifespan. The handheld STETZERiZER® Microsurge Meter, which also plugs into an available outlet, allows you to measure the efficiency and effectiveness of your filters.

Recommended Usage

To help combat the negative effects of electrical pollution, it is recommended that the average home install 20 STETZERiZER® Filters. We define the average home as one having three major electronic devices - primarily televisions and computers in most cases. Your home may need more or fewer filters depending on the size of the home, the amount of electronic equipment, where you live (urban, suburban, rural), and the quality of the power from the electrical grid.

To ensure optimum performance of STETZERiZER® Filters, the STETZERiZER® Microsurge Meter is required for initial installation and highly recommended for periodically monitoring electrical pollution levels. The Meter measures the amount of high frequency energy present on the electrical wiring, denoted in GS (Graham-Stetzer) Units.

STETZERiZER® Filters are designed to be installed throughout the home in a pattern that corresponds to the distributed nature of the need. For example, installing two filters close to a desktop computer or a television is normally appropriate and effective, and we recommend installing filters at these outlets first as this tends to reduce overall filter needs. Then you can simply pick a room in your home to start measuring and installing additional filters. We recommend starting with bedrooms, and leaving the kitchen as the last room to filter.

The process for determining which outlets in your home need a STETZERiZER® Filter is simple
  1. Plug in the Microsurge Meter to the outlet and note the reading.
    • This reading may fluctuate rapidly and over a large range at first, but should become more stable as more filters are installed throughout the home.
  2. Leaving the meter plugged in, plug in a filter at the same outlet and check the reading again.
  3. If the meter reading has decreased significantly (at least 20%) after installing the filter, leave the filter installed.
    • Even if the reading after applying one filter remains over 50 GS Units, do not apply another filter at that outlet at this time. Make a note of the after-filter reading and measure again after testing of all other outlets has been completed.
  4. If the reading did not decrease significantly, unplug the filter; it is not needed at that outlet.
  5. Unplug the Microsurge Meter and move on to the next outlet in the room to repeat Steps 1-4 above.
    • Repeat this process until all electrical outlets have been tested. Electrical outlets in the basement, garage, and any electrified outbuildings are to be included in the testing process.

Following the above installation process typically results in all outlets reading 50 GS Units or less. Independent research and more than two decades of experience have shown that for Microsurge Meter readings above 50 GS Units, additional filters should be installed. Readings of 35 or lower indicate an acceptable environment, while readings between 35 and 50 are generally acceptable, but should be reduced, if possible, if anyone in the area is electrically sensitive.

Please note that it is ineffective to rely on two or three STETZERiZER® Filters to maintain a clean and healthy electrical environment. Installing an inadequate number of filters may overload the filters, and will not provide the desired results.


The average home requires about 20 STETZERiZER® Filters and the STETZERiZER® Microsurge Meter to adequately reduce electrical pollution. So, we've put it all together in our convenient STETZERiZER® Home Kit so you'll have all the tools you need to get the job done right.