I am a new chicken keeper. I transferred the chicks to the outdoor coop a week ago. Prior to transferring them, I put down an inch and a half of wood shavings as well as some straw on top of that. The chicks have been in the coop for a week. I would like to try the deep litter method in the coop and would like to use pdz to help eliminate any odor build up. I am confused as to how to incorporate pdz in the coop. Do I have to first remove all the bedding that has already been put down or can I apply the pdz OVER the bedding already in the coop?