I have since 2 years a problem with normal mites, and one thing that I know about mites is that they will survive anything and the next population will be resistant to whatever you gave them.
So for mites alternating at least 2 things is essential.
Not sure why everybody keeps saying that if it's extracted from plants is fine. There are deadly toxins that can be extracted from plants.
You need to try something though, that is for sure. You can find DE by the way on ebay.de. I bought it and used a bit and it does have an effect, it's called Kieselgur, find one that is finest powder.
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