I mix reptibark and coconut husk. Some times I reuse the reptibark portion, but I have to sift it out first so this is not often. I like the ease of spot cleaning, the appearance, how it holds humidity, and that the reptibark has been helpful in Kitty's shed. He moves the substrate where he wants it then moves about it when he is in shed, he rubs against othe things of course but I have seen him do this so I keep the reptibark.