Cat litter can be placed in the toilet or on the balcony, but it is best to choose the balcony, because the balcony is relatively dry and ventilated, which can prevent the cat litter from getting damp and breed bacteria, and also helps the cat litter to disperse odor. You should clean the cat's litter box regularly and keep it clean and hygienic. If the litter box smells too strong, the cat will not like to go to the toilet in it.