Though I copied it right from the page you're right it didn't work as a click through for me either. This did...google Colorado State Information Insects Mites...Arthropods of Colorado-Agricultural Biology-Colorado State...scroll down to ACARIS.
Controversial true, but I think it's worth keeping in the loop if it even helps a bit. Interesting article re/ mites, mentions DE and what it does seem to do.
webdoc.agsci.colostate.edu (Dept of Bioagricultural Sciences and Pest Mngmnt, Colorado State Univ.)
All the suggestions I've read here are good and worked for my birds...frozen fruit ice blocks, electrolytes, shade, wetting down the ground and a fan if you can hook one up. I have a suggestion about something that the heat makes worse...I had a mite problem in my coop this week during the...