Easy to clean.No need to change for one weekSystem toilet seat The No. 1 cat toilet (based on intage SRI research.2016.1-2017.12) ● Will not smell for a week even in rooms that have been closed.Antibacterial agents strongly suppress odor; The absorbent surface of the sheet is white, so you can easily see the color of the cab and check your health.Uni-Charm Pet