Made from 100% calcium carbonate, CaCo sand was developed to provide a safe and hygienic ground for many desert-dwelling reptiles. Designed to be digestible if accidentally ingested, it reduces the risk of impaction in a reptile. Available in a wide range of colors, it is ideal for use in a natural setting or a live enclosure. Turtle Breeders Tip: If CaCo sand is the substrate of choice for your turtle breeding operation, it is recommended that only natural colors be used.