1. Fill the litter tray with litter to a depth of 7 cm. 2. Remove waste from the tray every day. 3. Dispose of waste directly in the bin, not in the toilet. 4. Add the same amount of clean litter as was removed. 5. Clean the litter tray once a month. Always wash your hands with soap after any contact with the litter. Keep the litter box away from food.