The Pure Power Plug-In utilizes the latest in energy management and techology. Satic's proprietary design, a combination of analog and digital technology, is the result of existing wave-form correction and harmonics filtration methodologies by industry leaders. No other Energy Management System has this extraordinary combination of application specific circuit board design, optimized power conditioning, voltage regulation, nano-surge filtration, electromagnetic field and negative harmonics reduction and extremely robust surge protection, all packaged into Satic's unique design; allowing it to be smaller, more affordable and more effective than anything else on the market today at any price. - How Many Pure Power Plug-Ins Do You Need? 2 Pure Power Plug-Ins will condition the power of an entire home, less than 3,000 square feet or a small business office. For even more efficiency or larger homes, additional units may be used. Residential homes are wired in single phase electric power, which is then divided into Phase A and Phase B. The circuits follow the pattern A, B, A, B in the breaker box. These will be labeled for specific rooms or appliances in your house. In regards to dirty electricity reduction, unless you have a Stetzerizer Meter or Greenwave EMI Meter, you will not be able to measure the reduction visually.