World's Best Cat Litter Multiple Cat Clumping Formula prevents the gummy mess in the bottom of the litter tray and is suitable for households with many cats. Its exclusive microporous structure eliminates odours naturally without the use of chemicals or perfumes. It is completely safe for you, your family and your cat, being organic, non-toxic and 99% dust-free. Easy to clean up too - it clumps, so you all you do is scoop it out. Biodegradable and environmentally friendly, this litter is flushable and will decompose naturally no matter how it is disposed of.