Despite the shortcomings, for us it is the best filler. Because It holds the smell very well, spreads, but not as much as others.
With its pros:
Holds the smell better than other fillers. We tried different ones - silica gels, corn, woody, katsan.
Some cons:
The granules are not very large, and therefore they are carried around the apartment on their paws, sometimes cats leave white spots with their paws. The price is not cheapSee full review