Original Natural Cat LitterAs a clumping cat litter, Cats Best Original uses the natural power of active wood fibres, which effectively absorb liquids and odours up to seven times their own volume, and trap them deep inside. This neutralises odours so effectively, that the cat litter can remain in the litter tray for up to seven weeks. Cats Best Original functions best when you regularly dispose of the solid excretions and clumps that form after the cat has used the litter tray