Stetzerizer Filter, Model: GS-F110-A, Electronic Store

These work! Graham Stetzer brand is the gold standard for reducing dirty electricity.Also FYI, to measure dirty electricity you need a microsurge meter (it has an electrical outlet that plugs into the wall). To the other reviewer who gave 1-star, the Advanced GQ EMF-380 V2 Meter is a good meeter, I have one too, but it's incapable of detecting dirty electricity. So there's no way for you to use that GQ meter to determine if these filters work or not. The EMF-380 only detects the presence of RF, EMF and EF. Dirty electricity isn't about the presence or absence of these fields - what makes the electric dirty is when it has a high frequency (measured in Volts per second).

Prongs unable to connect and hold positionProngs shortened in length

I did an EF check with my new meter from Amazon and this stetzer filter does nothing at all that I can tell. The meter is apparently pretty good and gives sensitive readings, but the filter is a non-performer, a waste of money. If only I had had the meter when I bought the filter I would have sent it back. Used the Advanced GQ EMF-380 V2 Meter.

The only way to test / use these filters is by using a LINE EMI METER. If a person does not understand the difference between RFs and DE (like the 1st person here who left a review) then they shouldn't be buying one of these. You should be getting a mitigation from a professional who knows the difference. Also, most homes need 5-10 of these depending on a LOT of factors. Such a shame that so many people are buying these without knowing how to use them properly. I'm a professional Mitigator. There has never been an outlet (ever) in which the DE has not been reduced. They work, every time, and are based on DECADES of engineering (power filtration used in the commercial industry for years).