Natures Ocean Hawaiian Puka Shell 6.8 Kg / 15 Lbs

Grain size:2.5-3.5 mm Benefits of Nature's Ocean® Reef Substrates: •Ideal for reef system tank bottoms •Denitrifying anaerobic beds •Extremely high surface area filter media •Increases Carbonate Hardness •Reduces Nitrates •100 % From The Ocean Floor •Maintain pH •Provide Marine Trace Elements •Heat Sterilized •Ideal for culturing Live sand Recommended: Use at a rate of 10lbs per square foot of the tank floor's bottom area which yields about a 1" deep covering. Depending on your needs or preferences the depth may vary from 1/8" to 3"s of covering.