Cats Best Wood Litter. Voted “Best Buy Litter 2006” and “Highly Commended Litter 2007 08” by Your Cat magazine, Cats Best OkoPlus is the only wood based clump-forming, biodegradable eco cat litter on the market. Made from 100 percent pure organic fibre, it binds liquid and odour effectively inside the fibre and boasts up to 3 times higher yield than mineral-based cat litters. It is compostable and 100 percent biodegradable, and, depending on local disposal laws, can be disposed of safely via your toilet.Dispose of in household toilet. Economical. 100 percent biodegradable. Binds liquid and odour effectively inside the fibre and boasts up to 3 times higher yield than mineral-based cat litters. Made from 100 percent pure organic fibre.