IME, using clean power does improve reliability of electronic equipment. E.g., fewer blue screens of death. etc. In the professional environs of NASA, data-acquisition, such topologies are used in signal conditioning or "line/power conditioning".
Stetzer, the maker of filter, does use the proper metrics equipment (Fluke o'scope, pwr analyzer, etc) in those demo videos. E.g.:
(Confusingly, the "GS" units, or Graham-Stetzer units, displayed on the meter are the manuf's OWN units!)
Forget about the human/health effects ... all the years of heavy drinking, smoking, overeating, heroin use, etc., means I'm done for anyway ...I'd rather have a/the filter device to save my delicate plugged-in electronics.
The Graham meter was actually patented by a UC Berkeley prof. (Martin H. Graham) in 1994.
http://www.eecs.berkeley.edu/Faculty/Homepages/graham-m.htmlLinks to the patent and circuit are at the above page.
Anyway ... $35/filter is too steep for me. I have experimented with Auricaps (a high-end audio X-capacitor) but results are inconclusive.
Come on folks, someone with Frequent Amazon Miles buy the whole $630.00 Stetzer kit and do a proper teardown!
BTW ... the "audiophile" world has been using these types of products for decades. E.g., PS Audio calls 'em Noise Harvesters...
Similar "audiophile" devices include stuff on the right-hand side of this page under "Other Items of Interest":
http://www.musicdirect.com/p-7419-ps-audio-noise-harvester-in-black-ea.aspxIncluding the $200 SHUNYATA - VENOM DEFENDER, and the $40.00 AUDIOPRISM - QUIETLINE FILTER MK3, and the $350 QUANTUM - QV2 AC LINE HARMONIZER.
Save your pennies, audio-fanboyz.