Exquisite stone-shaped design: round surface and flat bottom make the stone surface stable and frosted, delicate and smooth. Increase oxygen: air volume is large and the air output is even, an ideal way to add oxygen and reduce CO2 levels to your hydroponics, circulation, pond, aquarium and aquarium system. Material durable: The aquarium air stone disk is made of sturdy and durable sandstone and stainless steel material, can be cleaned repeatedly, using for a long time. Keeps the fish healthy healthy and active: the air stone was burned at high temperature, good air permeability, it is safe, washable and durable, non-toxic material keeps the fish healthy and active. The ideal disc air stone for freshwater, saltwater, hydroponic aquariums, or in water farms, water cultures, creates stunning underwater scenes. < p>An air stone, the purpose of which is to gradually release air into the tank and provide oxygen for the fish to breathe, is a necessity to have around your home if you are a water animal lover. Air stones are made of high quality non-toxic mineral materials. With high temperature sintering, the stones are sturdy and durable, have high dissolved oxygen, and create uniform, tiny bubbles rather than a limited number of large bubbles. The bubble stone has the following features: - Super sturdy and durable. - Weighs enough to sink to the bottom , no need for suction cups. - Dissolve more oxygen in water. - Produce smooth and dense small bubbles in water. - High filtration, for fresh and salt water. - Easy to clean. Scope of supply 1 * air stone