I don't know what is available to you, but not long ago I had a mite infestation for the first time ever. I got some permethrin spray and sprayed all of my coops and gave the birds a spray when they were roosting. At first I thought the birds were molting but they didn't look right so upon inspection I saw the mites. Originally I sprayed the coops and nest boxes good, every crack and crevice, walls, floors, everywhere. Lately I have been spraying every 2 weeks. Haven't seen anymore mites. I have no idea how they got here. I hatch all of my own chicks. I haven't brought any new birds into my flocks.