CATSAN Clumping Litter consist of very fine clay granules that immediately form small firm clumps when coming into contact with liquid. These compact clumps can be easily removed every day, so that only clean and dry litter remains in the litter tray. There is no time for odours to develop, The formation and removal of small solid clumps means you don't need to replace the entire litter tray as often. That is why CATSAN Clumping Litter lasts much longer than conventional lighteweight litter products.