Scooping daily will keep odor in check and aid in keeping your cat healthy. Periodically add new litter to maintain the recommended 3-4 inch level. This will enable your cats to bury their mess properly while keeping urine from reaching the liner or the bottom of the litter box. Fully replace litter every 5-7 days. Wash the reusable liner and the litter box interior with low fragrance dish soap and warm water.