Fresh Nest utilizes corncob particles, a renewable, natural resource, in an odor controlling system that is effective and safe for all caged bird species. Fresh Nest corncobs have been sanitized by the Purlite process and safety tested for birds. Highly absorbent so it maintains a dry surface which can lengthen cage cleaning intervals.The Purelite Process from Green Pet Products:Until now natural based litter and bedding products contained a number of different microbes, molds and spores, some of which could be a health risk to your pets. Green Pet Products, Inc., developed through extensive research and testing the PureLite Process to sanitize our products. This process sets a new standard for cage bedding and litters. Enjoy the benefits of a cleaner, fresher, and healthier environment for you and your pet.