Carib-Sea Seaflor Special Grade Reef Sand - 15lb

CaribSea Geo-Marine: Florida Crushed Coral: The only aragonite crushed coral available. This sand is a mixed grade of crushed coral unlike the Seaflor, which is a more consistent grain size. On the average, the grain size is slightly larger. CaribSea Seaflor Special Grade Reef Sand: 1 - 1.7mm diameter grain size. This grade is specifically engineered for nitrate reducing beds. The pore water space created by precision grading also allows maximum pH support and dissolution of calcium carbonate.