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Marukan Deodorizing Ball for New Style Toilet is to be used together with Marukan New Style Toilet with Drawer. Lay it in your pet’s litter and it lasts about 1 week. As it does not absorb pee yet it eliminates the smell, thus, you do not have to worry about the balls inflating to the point that it will overflow. With active ingredients of silica gel and activated carbon deodorant with anti-bacterial properties, it can absorb the smell of about 0.4l of pee.