I use for any mites what was recommended by a show breeder here and yes I understand that they want results and aren't interested in natural products. But I had a real problem with mites of both types...( red and other) I used a cattle drench that you put on the skin and it works amazingly... you apply it according to the chickens weight and mostly I am putting on about 0.1 or 0.2 ml per bird.
This year I haven't had red mite at all and in my books this is far far better than anything else.
DE does not work.
This is just my opinion and I'm not asking for an argument in any way