Changing you screen or keeping it clean really makes the vaporizing experience much better than a clogged screen. We suggest changing your screen ever 10-15 bowls, or when you notice your wand becoming clogged. You may have to clean or change it more often if you are vaping hash, keif or some really really good dank. You can see how to best change your screen here . Remember the best way is to flip that screen when it is in there.