Mineral Mud™ - A unique blend of sediments that duplicate tropical fringing coastal mangrove environments. Its particles are in a size range compatible with soft, burrowing infaunal, macro animal assemblages. Ideal for mud refugiums, seagrasses, macro-algaes, and mangroves, Mineral Mud™ provides a variety of trace elements plus calcium, strontium, iron, sulfur and free carbon. In addition, Mineral Mud™ contains live marine bacteria to complete the tropical ecosystem. About 82 pounds per cubic foot.