The purpose of this study was to test the effect of the Graham/Stetzer microsurge filters on the wellbeing of teachers and on the behavior of their students in a private school (grades 1 to 12) in Toronto, Canada. GS filters remove electromagnetic frequencies from 4 to 100 kHz on indoor wiring and they were installed in this school because one of the students is electrically sensitive. Teachers were asked in a single blind study to complete a questionnaire daily between January and March 2003 for a 6-week period (3 weeks with and 3 weeks without filters). Eighteen teachers out of 49 completed the questionnaire enough times to enable statistical analysis. Symptoms improved for 55% of the teachers and got worse for 11% of the teachers while the filters were installed. Three teachers (16%) had no response to the filters and another three (16%) had mixed reactions (some symptoms improved and some got worse). Overall teacher wellbeing improved while the filters were in place. Teachers were less frustrated, less tired, less irritable. They were better able to focus and had better health, improved mood, and greater sense of accomplishment. Student response appeared to be age-specific with younger students responding more favorably than older students. This preliminary study needs to be repeated in other schools. If the Graham/Stetzer filters are as effective as they appear to be, then the dirty electricity in schools, homes, and offices can be reduced until other methods are in place to minimize the production and distribution of this form of electrical pollution.
Havas, M., Illiatovitch, M., & Proctor, C. (2004, October). Teacher and student response to the removal of dirty electricity by the Graham/Stetzer filter at Willow Wood School in Toronto, Canada. In 3rd International Workshop on the Biological Effects of Electromagneti Fields (pp. 4-8).