Bad and useless rug.
It doesn’t catch all the crumbs from the cat litter; they still lie around. But what got into it cannot be cleaned with a vacuum cleaner, brush, or water; they are stuck there tightly.
Either way, cleaning will take a long time.
And so the rug is full of litter's residues looks dirty and ugly. But when you take it in your hands then everything fells down out of it. Horror!