AquaVita Air Stones are perfect for circulating and aerating water in aquariums and hydroponic systems. Constructed of high-quality Carborundum and ceramic materials fired at 1350C, the AquaVita Air Stones.AquaVita Air Stones are perfect for circulating and aerating water in aquariums and hydroponic systems. Constructed of high-quality Carborundum and ceramic materials fired at 1350C, the AquaVita Air Stones work especially well with our AquaVita Air Pumps!