The core ingredient of most conventional cat box fillers is naturally absorbent clay. While clay provides some odor control, additional ingredients can be added to control the growth of odor-causing bacteria and to diminish dust.
In fact, there have been numerous breakthroughs in cat box filler technology. Time-release agents can control odor longer between litter changes.
Scooping fillers offer moisture-activated clumping action, so that waste can be isolated and scooped out, leaving behind only clean litter.
And the latest breakthrough in cat box filler technology is Tidy Cats Crystals® which is made from silica gel. Each granule is covered with micropores that evaporate moisture and trap odor. It is so effective at absorbing moisture, it can stay dry for up to 30 days (for one cat).
Whether you choose conventional, scooping or Tidy Cats Crystals®, Tidy Cats® makes a filler that is just right for you and your cat.