Usage Instructions: Pull out the litter box drawer from your cat's litter box. Locate the hook on the front wall of the drawer where the old filter is attached. Remove the old filter from the hook. Slide the new litter box filter into place, ensuring it is securely attached to the hook. Push the litter box drawer back into the litter box until it clicks into place. Dispose of the old filter appropriately. Enjoy a fresh and odor-free environment for you and your cat.