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 Detail

The Graham-Stetzer Filter

Installation Instructions

Basic installation of Graham-Stetzer (G-S) Filters throughout the household is simple and straightforward. Follow the instructions below for the best results. Please note that for the more involved exercise of installing filters on the A/B Phase, refer to the A/B Phase Instructions below. It is highly recommended that a professional electrician is consulted.

Read through these instructions completely before installing your filters.

Product Detail

The Graham-Stetzer Filter

Important Points

Dirty electricity can be attributed to three main sources: the hydro lines that carry electricity into your home, your neighbor's electrical usage, and whatever you generate in your own home. While targeting the A/B phase with G-S Filters can remedy the problems of dirty electricity from the first two sources, installing the G-S Filters throughout the home is the best way to clean up your own electrical environment.

During installation these following steps are important:

  • An adequate number of filters should be installed close to the primary sources of the electrical pollution. For example, install filters near the input power panel if the G-S meter shows it is a pollution source.
  • The installation of filters should proceed sequentially from the primary sources toward the areas of lower pollution.
  • To make the most significant impact on reducing the source of internal pollution (e.g. a computer), be sure the filters are installed on the same circuit.

Product Detail

The Graham-Stetzer Filter

Step-by-Step Instructions

The aim of filter installation is to clean the electrical circuits in your home of dirty electricity. Once one circuit is clean, it is time to move to the next circuit. Be clear — it is not a matter of cleaning the separate electrical outlets, it’s a matter of cleaning the circuits that the outlets are on.

As patterns of electrical wiring can differ from home-to-home it’s best to adhere to the following sequence of instructions.

  1. It’s recommended that when conducting the installation of filters that the house is in its normal state with respect to electrical usage. Therefore, turn on the computer, television, and lighting, especially halogen lights. Note that dryers, stoves and 220-volt appliances are linear in nature and do not usually add resistance to the line.

  2. With your G-S Microsurge Meter, record readings of the electrical outlets throughout the home. To take a reading, simply plug the meter into an electrical outlet. The meter will not read above 1999, so if you see a 1____ then your readings are above 1999.

  3. Begin installing filters by plugging the meter into the upper receptacle of an outlet, taking a reading, and then plugging the filter into the bottom receptacle. If the meter reading decreases significantly (at least 10 points) then leave the filter installed. If not, remove both the meter and the filter and move to the next outlet.

  4. The key to effective installation is to place the filters as close to the power source as possible. It is recommended that power bars be used (or a “T” extension when necessary) as some appliances show a dramatic benefit from with the installation of two filters.

  5. For a computer, plug two filters into the power bar. For a television, use one or two filters. Plasma or LCD televisions may require three to four filters to achieve desired levels.

  6. Go to the electrical panel and locate outlets that are in close proximity. Install filters. If you have outlets off the A/B Phase (that is, off the electrical panel) place two filters in the A outlets and two filters in the B outlets.

  7. Continue to measure and install filters throughout the rest of the home, though measure the kitchen last.

  8. Kitchens typically feature split receptacles, which means the top and bottom outlets are not related as they are throughout the rest of the house. This allows you to run a toaster and kettle, for example, from the same outlet without blowing a fuse. Therefore, use an extension cord or “T” plug to take a meter reading with the filter installed at the same time for each outlet (upper and lower individually)

  9. For apartment and condominium dwellers who share an adjacent wall with a neighbor, it may be of benefit to ask your neighbor to install filters along the shared wall to lower the readings.

  10. If you are unable to achieve meter readings below 30-50 after installing numerous filters, then it is likely that the source of dirty electricity is due to the hydro lines. This may necessitate filtering the A/B Phase, provided it has not already been done. Please refer to the enclosed instructions concerning the A/B Phase (Installing Stetzer Filters Adjacent to an Electrical Panel). Installing filters on the A/B Phase usually means that fewer filters are required throughout the house.

  11. For more information regarding the installation of filters, plus more detailed technical information, please refer to the Graham-Stetzer web site or call 608-989-2571.

Product Detail

The Graham-Stetzer Filter

Installing Stetzer Filters Adjacent to an Electrical Panel (A/B Phase)

Users who are unable to reduce their meter readings below 30 after installing filters throughout the home might consider installing 2 - 4 electrical plugs to accommodate 2 - 4 filters adjacent to an electrical panel. This will help to filter the electrical pollution associated more directly with hydro wires and the electrical activity generated by your neighbors, thereby making it far easier to clean up the dirty electricity created by computers, lighting, televisions and related equipment inside the home.

Please note, while the following instructions detail how to install these outlets, to ensure optimum safety Stetzer Consulting recommends using a professional electrician.

Step-by-Step Instructions

Most homes and offices do not have the necessary electrical outlets close to the electrical panel for both the A and B phases (the plus and minus 120 volt) to equip the necessary Stetzer filters. Two Stetzer filters for each phase should adequately clean up the input power, though the principles outlined here are still applicable when more than two filters are required. 

Materials and Physical Layout

To add two outlets for both phase A and phase B, first acquire the following materials:

  1. Two 4" by 4" receptacle (handy) boxes each containing two electrical sockets.

  2. Two offset nipples (conduit connectors) to connect from the panel to each receptacle box.

  3. Color-coded #12 wire (or otherwise suitable wire).

Install the two receptacle boxes in appropriate proximity to the electrical panel. The suggested location is to establish the two receptacle boxes below the electrical panel at a distance that allows the two offset nipples to easily connect between the electrical panel and each of the two boxes.

Electrical Connections

The electrical connections are made using the #12 color coded wire as follows:

  1. From the 120 volt A phase terminal block in the panel to both electrical sockets in the first receptacle box.

  2. From the 120 volt B phase terminal block in the panel to both electrical sockets in the second receptacle box.

  3. From the neutral terminal block in the panel to the neutral side of the four electrical sockets in both receptacle boxes.

The receptacle boxes should be grounded to comply with safety and local regulations.


Installation of the Stetzer filters in the receptacle boxes is described in the Graham-Stetzer Filter Installation Instructions

Attachment 1 — Background Discussion

The following is meant to provide a background for the installation of filters on A and B phases (hot wires) entering a home, office or farm.

Three and Four Wire Systems

There is no inherent benefit of four-wire systems over three-wire systems. In fact, due to power quality and ground current problems, a four-wire system is not a solution for electrical pollution.

A system is defined as a four-wire system when the neutral and the ground wires are kept separate at all loads at the panel (and any sub-panels), and connected only at the low side of the utility transformer (the center or neutral point).

A system is defined as a three-wire when the neutral and ground wires are connected in the panel, and in some cases at other points on the electrical system closer to the load.

Connections for Three- and Four-Wire Systems

One of the two terminal boxes added to support filter plugs is connected between the A phase and the neutral. The second box is connected between the B phase and the neutral. This is independent of whether the system is three- or four-wired.

The new terminal boxes must be connected to the ground terminal from the panel, as stipulated by most local electrical codes.

INPUT: 110V- 50/60Hz


CAUTION: To reduce risk of fire or shock, use indoors only.
Stetzer Electric, Inc. Blair, WI 54616, USA.

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