Filters Overview

Electropulse Filter

Fitting a few "Electropulse Filters" in your house helps reduce the Dirty Electricity, by lowering the common-mode high-frequency noise on your house wiring. They plug in (and occupy) a standard 13A mains power socket. We suggest a maximum of one-per-room and, in the first instance, probably just starting with two for the whole house. Please note that they don't lower the power frequency electric fields created by house wiring, only the high-frequency noise on the line itself.

These are fitted with a UK style plug, and will require a socket adapter to be used in many other countries. You do not require an earth pin on your system for the filter to work correctly.

Mains filter

This unit contains a powerful mains conditioning filter which will reduce or eliminate interference on your house mains electricity supply coming from computers, TVs, videos, modern switched-mode mains adapters and chargers, etc. The filters are designed to dramatically reduce both "asymmetrical" as well as "symmetrical" interference. It uses high frequency capacitors and an inductor/choke as well as an earth line choke to stop interference through the mains earth line. It uses a screened mains cable to eliminate the effects of radiated noise interference.

• Space for six UK plugs
• Includes surge protection
• Stops "dirty mains" and RF signals being sent into your house wiring
• Greatly reduces interference from external sources
• Often improves picture and sound quality with AV equipment
• 2 metres of screened lead

ADSL Filter/Ferrite

Some people who are sensitive to EMFs find they react to ordinary wired telephones. This can be due to electronic "noise" coming through the wire from the telephone socket. This noise is almost universal in the UK now, even if you personally do not have a broadband internet connection. This double filter reduces the electromagnetic noise dramatically, as can be seen in the graph on the "ADSL details" page.

» View ADSL filter details

ELF Ferrites

These ferrites are high quality general purpose ferrites, and are highly effective at lowering the type of Dirty Electricity normally found on house mains, produced by electronic goods. They are appropriate for fitting to cables that may be carrying Dirty Electricity close to areas where large amounts of time is spent, such as bedside lamp leads or alarm clock leads. These ferrites are also suitable for clipping onto telephone lines if an ADSL filter cannot be fitted for any reason. One size fits all. Very thin wires can be wound round in a loop so that two lengths pass through the core. If the diameter of the lighting cable is thin then the hole in the ferrite can be made smaller with cling film or any other suitable non-conductive material.

RF Ferrites

This ferrite is optimised for 25 MHz to 2500 MHz frequency and is therefore more suitable for filtering out microwaves on your electricity wires created by mobile phones and other devices working at these frequencies. Light cords that dangle into the room are often at a length where they naturally act as an aerial for the mobile phone frequencies, re-radiating the electromagnetic fields that they pick up back into the house. Clipping this ferrite to the light cord will prevent the vast majority of these signals from going into the wiring, thus reducing the Dirty Electricity. They can also be used on wired Hands Free kits for mobile phones, to help lower the fields going up to the earpiece. Alternatively, an airtube headset would eliminate the need for this and offer better RF protection. Please note that once this ferrite is clipped firmly shut, it is difficult to reopen, so don't clip it shut completely until you are sure it's in the right place. One size fits all. If the diameter of the lighting cable is thin then the hole in the ferrite can be made smaller with cling film or any other suitable non-conductive material.

Foil Tape

A roll of aluminium foil tape 45 metres x 50mm. This can be used to secure lengths of foil where required, to provide good conductivity between sheets of plasterboard, or to cover curtain battens or skirting boards that cannot be removed, or for surfaces such as kitchen work surfaces, which can need frequent cleaning.

Filtering Powerfrequency (Electric) fields

Please note you cannot screen out magnetic fields with any of these products. The exception to this is the Demand Switch which will also lower magnetic fields when the supply of electricity is cut off.

Technical expertise required

Please note that you need an electrician or somebody competent in electrical DIY to install this.

Electricity Demand Switches

A demand switch inserted into selected house circuits will reduce electric and magnetic fields. This is especially useful while you sleep when low levels of EMFs are necessary for an optimal immune system. People with EHS will find demand switches helpful in regulating their electricity supply to reduce EMFs at all times practicable.

» View demand switch details

Earthing Leads

The earthing leads we supply consist of a square of copper foil with a conductive glue backing. A 2 metre length of thin wire is soldered and glued onto the copper foil. The other end is stripped of its plastic covering. We also supply a 5 cm square of aluminium foil tape to cover the copper foil when it is in place. This reduces the likelihood of its being pulled away from the wall.

Earthing Wire

If you want to make your own earthing lead, but are unsure where to obtain the wire (or unable to get there) we can supply this at 30 pence per metre.

Laptop Earthing Leads

There have been recent postings on internet bulletin boards about high voltages being measured on some laptop computers when connected to their mains power supplies (PSUs). They are what is called "double insulated" and do not require a safety earth connection. Unfortunately this also means that the low-voltage supply to the laptop then "floats" to typically half the mains supply voltage (i.e. about 115 volts AC in the UK). There is not enough current to electrocute you, but it does expose you to high levels of electric fields of several hundreds of volts per metre at your hands (and lap). So, if you are buying a new laptop, we suggest that you choose one with a 3-pin mains connector on the PSU. If it does not have a 3-pin mains connector, we suggest you use a safety Earthing Lead when you use your laptop with its mains PSU. We supply these either with or without a plug. Plugs supplied are standard UK 3 pin plugs, so if you are ordering from outside the UK, we suggest you buy them without plugs, and fit your own.

Lead with plug	Lead without plug
£11.34 (inc. vat) In stock:	£9.96 (inc. vat) In stock:

USB Extension Cable

If your laptop is one that does not have any metal connections at the back, you will need one of these in addition to an earthing lead. It is a high quality, fully screened USB extension cable. Many USB cables are only partially screened along the length, unlike ours, which is fully screened. This screening is necessary in order to be able to earth the laptop! The nice thing about using this for your earthing purposes is that it can also be used as a normal USB extension cable.