From the "Deo Sheet" brand, it eliminates odors even without changing for 3 days. Regular Size The upper antibacterial dry filter allows urine to pass through without leaving it on the surface, and the lower powerful absorbent/deodorizing mat traps 3 days' worth of urine and odors. You won't feel the presence of urine, and it's always comfortable. Main Unit Set Toilet unit: 1 Filter: 2 Mat: 4 Antibacterial dry filter: 4 Powerful absorbent/deodorizing mat: 10 Purchased at Aeon Style, Meguro. Reason for selling: My dog couldn't get used to it and couldn't use it. As shown in the fourth photo, there is a small hole in one of the antibacterial dry filters.