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CaribSea Dry Araganote Seaflor Special Grade Reef Sand Seafloor Reef Sand Special comes in a 40 lb bag. CaribSea Seaflor Special Grade Reef Sand - This grade of aragonite is specifically engineered for plenum type nitrate reducing beds or anywhere a deeper bed is called for. The pore water space created by the precision grading also allows maximum pH support and dissolution of calcium carbonate. Nobody puts as much effort into bringing you the quality and selection of aragonite products as CaribSea Dry Araganote Seaflor Special Grade Reef Sand does. All of CaribSea substrates are scientifically sound and proven products.