Cats best is up to 3 times more efficient than conventional clumping cat litter because the natural plant fiber capillary system is very effective in retaining fluids. Cat's best ã-ko plus can be used more often and is therefore more economical than many other types of cat litter. This is a one of a kind cat litter that is 100 percent biodegradable. It has a pleasant artificial smell with no added fragrances. This litter is a wood based cat litter, made from the finest plant fibres from untreated native fir and pine timber. This timber is readily available and the felling of such trees helps to promote healthy, natural forests, making it easily disposable.