Graham-Stetzer filters have been proven to remove the “Dirty Power” from the wiring in homes, schools and offices. Studies are showing that people exposed to electro-magnetic (low level radiation) frequencies are experiencing PTSD like symptoms. EMFs are also causing the exacerbation of health problems such as headache, migraine, blurred vision, attention deficit, stress, chronic fatique and joint pain to name a few. Ensure that you and your family are not standing in harms way of the new "Sick Building Syndrome"! see “Pure Power Canada” www.purepowercanada.ca