The Stroom Master® is our product designed to filter out AC EMF (dirty electricity) contamination generated by voltage transients and harmonics present in power lines. The Stroom Master® is also equipped with our patented SPIRO technology, it contains an amount of SPIRO material that is 3 times stronger than that of the SPIRO®®® CARD. This creates a joint effect that is able to filter out noise within the electrical wiring line, while also naturally polarizing the fields surrounding the electrical wiring and the area where the filter is connected (up to a radius of 8 feet). The Stroom Master® is a 2-in-1 filter that we recommend you place every 200 square feet or in every room in your home. Although it contains SPIRO material, it is primarily designed for dirty electricity, so we recommend using a SPIRO® DISC as well to keep your home completely free of electromagnetic pollution. This filter has been found not to affect the performance of the devices it is used with; On the contrary, laboratory tests have shown that it is fully compatible with them, optimizes their operation and extends their service life.