Non-toxic, harmless, non-radioactive, strong environmental adsorption capacity. Non-flammable, non-volatile. No specific storage requirements. Durable and long life. Long lifetime. Natural Aquarium Gravel. Will not alter the chemistry of your aquarium water. Non-toxic, Will not affect PH. Safe for use in freshwater aquariums. Multiple uses in Fairy gardens, flower arrangements, succulent containers, and potted plants.