I haven"t posted in awhile. My girls are laying in Upstate New York in December. WOW. My question, I have used construction sand in the outside covered run and it is very dusty. The girls have developed black around their nostrils and seem to be sneezing or trying to clean their nostrils. I've replaced the sand inside the coop with KleenKoop and that has worked well. Today I removed a lot of the sand and put down one bale of KleenKoop in the outside run. The girls look dirty because they dust in this dusty sand. What should I do or am I on the right path.