Compared to natural seawater, KENT Marine Reef Salt contains elevated levels of Calcium, Magnesium, Strontium and other elements to provide the essentials required for proper coral growth, skeletal structure development, and reef vitality.Kent Marine Sea Salt provides the essentials to simulate a natural seawater environment. Formulated using fine grain salt to dissolve easily and to supply an enhanced blend of both vitamins and minerals. These provide marine animals everything they need not only to survive, but thrive in their artificial environment. Fully buffered and provides a broad spectrum of beneficial major and minor elements, viramins, trace minerals, and enhanced levels of calcium, strontrium, and iodide.