1.) Tidy Cat
2.) Most of the time, have tried others, but always go back
3.) Tidy Cat, Cat Tails (horrible), Tidy Cat
7.) Odor control, price, low dust
8.) Don't recall
9.) Which brand? from the ad or that I use?
Hope this helps.
P.S. If you don't mind my asking, what school are you doing this for?