For clumping litter
Litter that has clumping abilities will absorb the moisture from the cat’s waste and stick together to form a clump. Thus, the soiled litter has to be scooped out daily while the clean litter can be left as it is.
The entire litter should be replaced at least once a month or more often if more than 1 cat is using it.
For non-clumping litter
Non-clumping litter will not clump the waste. This litter option will need to be replaced more often — approximately twice per week if you have 1 cat and more often if you have more than 1 cat.