Calcite is a naturally-occurring material, i.e. Calcium Carbonate. It is crushed and screened with marble media. The media is used to balance the pH balance of water. It removes acidity in water and leaves it in neutral form as a less corrosive effluent. It is used in residential and commercial acid neutralization systems. It comprises of pure calcium carbonate (calcite) replacement media for pH neutralizers. One of the advantages of calcite is its? natural creation, making it rather cheap. It has a slower reaction for controlled pH correction. The media has low uniformity which helps for ensuring maximum contact. The media comes in a 1/2 cu. Ft bag.