Thanks for all the info!
I ended up just using the DE. Im not a big fan of using chemicals, especially since we sell our eggs. A lot of our customers would be very upset to hear that we used chemicals on our chickens, and that they are getting a product that was treated like that.
I did a lot of research on it...Either using chemicals, or all natural, both have the same effect : they both kill the bugs on the chicken. The only difference, is that DE isnt harmful (and doesnt contain chemicals), and you can still feel safe about eating the eggs after.
Yes, I could see it causing respiratory problems, BUT not if you do it in a well ventilated area (outside), and give the coop time to settle before you lock the chickens in.
I found that the dust settled with in 10 minutes, though our coops are very well ventilated.
Anyway, That website was very helpful. It gave us some info that helped us branch off and find the answers I was looking for.
Also, Is it more likely the chickens will get lice/mites living on a dirt floor than say a plywood or other solid floor?
Our old coops have dirt floors - we are replacing them this summer with a nicer design that is raised off the ground, but are there more problems with dirt floors than a solid wood floor?