Such "Athonite Charcoal Powder" actually be used in many monasteries,traditional parish and families(not need to be 'athonite',you can make it by yourself,if you know the method). It's nature,non-chemic,and healthy.
To use this kind of powder,first you should have enough ashes in your censer,then make a "hole" in the middle of it, fill poeder into the hole(as much as you need,one spoon is good enough for cense once. After this,you 'bury'the powder with ashes,only leave a small spot uncovered.Now you have your censer ready.
Almost ten minutes before censing,light the bare spot of powder with a waxed-lampwick(or whatever other stuff,one matchstick for example). You just wait till the whole powder be turned on,then put incense on it.