Both the bigben filter is simply a disgrace and should not even exist than hori, once again, is perfect. Even without being gifted or have made specific studies of filter application, that one begins to own perfection. Is removed from half of the lower portion, once the filter in position. Then we remove the other half, there is no air bubbles, and has the ability to properly remove dust particles and other hair cats / garment flying. It removes the blue part and it's over.