If you mist it you don't get all the dust. Just like if you were planting something. You wet the soil a bit and you don't get all the dust. I've never had a problem with dust because I mist the loose kind and when you use the brick you have to wet it to get it loosened. Like I said you need to let the brick sit in warm water then make sure its all loose then let it dry out some so it's not wet when you put it in the cage. Thats a ggreat way of getting mold and getting your snake sick.