My Dad does a lot of woodworking and builds things like furniture, hand made chess sets, decorations etc... He has a vaccum system in his shop with a collection canister and he just dumps it when its full. I was thinking i could use it. I currently use hay and pine shavings in the coop and I probably clean it out too often, but I was wondering if I can use sawdust with the pine shavings and hay in the coop. Will the sawdust cause respiratory problems and/or will the chickens eat it and cause digestive problems. I'm just thinking that the finer sawdust will help with absorbtion of the sometimes runny stuff.