These DE2 filters have a larger capacitor (more effective at reducing DE) and, uniquely, have an internal electric field screen which greatly reduces the electric field around the outside of the filter. They also have an internal safety fuse and other components.
Technical detail: The unit contains a 15 microfarad a.c. mains-voltage rated capacitor, discharging resistor and fuse. Unlike some DE filters on the market these contain an electric-field screen inside the case which is connected to the Earth pin. Some filters on the market are not even internally fused. Our DE2 units are fully approved to European safety standards.
Please note that if you have solar panels installed it is unlikely that you will be able to completely eliminate dirty electricity with these filters due to the high levels of DE produced by the AC inverter.