Hi. Our hens have mites. I tired using permethrin premise spray in the coops & dusted the hens. I’m supposed to repeat Saturday. I’ve had it with these boogers. So I ordered Elector PSP. Planning on total cleaning again, and spray the birds. Do I need to spray the ground too? Is it the same dilution for the coops and the hens themselves? Is it truly a once and done thing? Or do I have to repeat it again? Thanks for all your help.