GreenWave Filters are the modern approach to dirty electricity mitigation. Dirty electricity is produced by normal household devices, and passed on to other homes through the electrical service. While still using the basic “plug-in” method of other’s, these filters boast more efficient and effective mitigation of dirty electricity. They even have a through-plug, so you can still use the outlet! There is a ground prong on these filters. These filters do not interfere with anything plugged into your outlets, or even the outlet on the filter. Remember, this is a filter, so some electricity must pass through the device, creating a small magnetic field. Designed for US and Canadian power distribution systems. Discount available for 8 or more. NOT a bio-energetic device. CE marked, and RoHS certified.