For a long time they used wooden filler, which they quite liked, although there was a lot of dust from it. But we decided to try silica gel, bought Cat Step, in the end we use only it
Got pros:
Perfectly retains odors, cats like to bury their "gifts" in it, It is convenient to change, add, mix
Cons:
Enough days for 20-25, then it is already asking to be replaced. A little, but still it hits the floor, and these pebbles are very sharp, it’s not pleasant to get up with bare feet by accidentSee full review