I'm seeing a lot of helpful information on Ivermectin dosages here, however, I'm a bit confused as to when I need to reapply it for northern red fowl mites and scaly leg mites. I'm using the pour on 5 mg strength. I keep seeing a second dosage after 7 days but I'm also seeing after 10 days. And how often am I supposed to reapply this for something as long-term of a problem such as scaly leg mites?