Bahamas sand is raw, naturally renewable politic aragonite sand that is up to 98% pure calcium carbonate. The grains are OOLITIC (egg-shaped) and smooth. It is tasteless, odorless and sustainable. Combined with its near chemical purity, size consistency, and small grain structure, Bahamas aragonite possesses numerous advantages making it a superior source of calcium carbonate. Bahamian Aragonite Aquarium Sand is the ideal substrate for marine, reef or African Cichlid aquariums. It is a pure Marine Aragonite sand collected from the crystal clear oceans of The Bahamas, with no harmful tar, organics or impurities. This aquarium sand has unsurpassed buffering capability and helps maintain a natural pH balance of 8. 2 without the constant addition of chemicals. One kg of Marine Aragonite Aquarium Sand offers over 1 million sq. cm of surface area providing a huge space for housing ammonia, nitrate and nitrite reducing bacteria. Marine Aragonite Sand is the ideal grain size for reef tanks, fish tanks, plenum systems and refugees.