Hi Angel10023,
I have had a good look at the devices at you mentioned from EntityRemovalTech. Two of them seem plausible to me, because they use elements of counter measures that are known to work. These two promising devices are the "Ion Ray Gun" and "Multi Wave Oscillator". That said, there are very cheap and effective alternatives if you want to try these ideas.
The "Ion Ray Gun" ionizes the air using a high voltage circuit which can be found in almost every commercial ionizer product. More effective and safer ionizers can be purchased for a very kind price from many places. I have pasted a link to one such negative ionizer product below:
https://www.ebay.com/itm/220V-Intell...oAAOSweM1Z-uPx
Strong radio frequency magnetic waves might well work, but strong magnets are an inexpensive and powerful alternative. Small but very powerful Neodymium magnets can be purchased for a very kind price indeed. You can buy these from Ebay, Amazon, Radio Shack, and many other places. There are also many varieties of wearable magnets that come in a variety of types (Bracelets, necklaces...etc).
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