With 5 cats, there's an odor problem. Especially when company comes over. I don't want people to walk in my house and think -- "oh, she has 5 cats." I spray Zero Odor® and I really don't have to worry about that now. One of my cats had a problem going outside the box. Since I started using Zero Odor®, it eliminates the odor to the point where she goes right back into the box.