I have 7 chickens in a coop with a very generous run space. I use a mix of ceder chips and hay in the run... my big problem of which is that it doesnt last long once any moisture is around. The combination of decomposing hay and chicken poo will literally knock you out and make you gag. I change the hay regularly once every 2 weeks...which is alot of work bc the hay soaks up moisture and starts decomposing. When it rains, the hay starts smelling within a day! While I would love to use sand in the run, we are on a hill and it would just run right out of the pen. Right now there is no permanant solution to the hay issue but is there anything a can put down to minamize the smell???