Like crystal cat litter and clumping cat litter, indicator cat litter also absorbs cat urine quickly like a sponge, locking in moisture and odor. But it has a unique function, that is, once it comes into contact with cat urine, it can change color according to the pH value of cat urine. Different colors represent different pH values ​​of cat urine, and the different pH values ​​displayed by cat urine can remind cat owners of the current health status of their cats.