I have a huge stack of notes that I have made regarding things I need to know about chickens. I have realized that there is no note to tell me how much DE to use in a coop. I have two coops....each 40 square feet. Just today I finally got some sand to put in them (only about 2-3 inches deep) and got a bag of DE. Tomorrow is the big day...putting in the sand and DE. I think I know to sprinkle the DE on top of the sand (I hope that is right) but I'm wondering just how much to use. I believe I read that it didn't take much, but does that mean a cup, a quart.....or what? Thanks!