Made from 100% pure natural clay for natural hygiene; pH-neutral. A mix of three different grain sizes: large grains = extra-fast odor control, medium grains = extra-strong clumping, small grains = extra-long reach. Biokat’s Classic consists of three different grain sizes: Our large grains have particularly many large pores. Similar to a sponge, these pores absorb liquids and odors. A handful of our large grains has the surface area of an entire soccer field! Our medium grains form particularly strong clumps. As soon as this grain size comes into contact with liquids, the medium grains cling tightly together, providing the clump that forms with stable support. Our small grains enhance efficiency. They spread throughout the litter and assist the medium and large grains in optimizing their performance. And one more advantage Biokat’s Classic offers you: No annoying litter tracking out of the litter box! This saves you time and effort on unnecessary cleaning. Since 1986, Biokat’s Classic has stood for 100% natural cat hygiene. With Biokat’s Classic, your cat's litter box stays fresh and hygienically clean for a long time.