World's Best 00628 Cat Litter, Extra Strength, 34 Pounds

This has been highly recommended to me.

* Completely flushable, septic-safe, biodegradable litter that clumps and scoops easily
* Made from all-natural whole-kernel corn that traps and absorbs urine and odors
* Designed for households with multiple cats that need more powerful clumping and odor control
* Extra strength comes from natural plant-derived ingredient; contains no perfumes or chemicals that may be harmful to cats
* Recommended for both conventional and mechanical self-cleaning litter boxes