Reef Salt is a dynamic formulation, specifically designed for the needs of the modern reef aquarium. Reef Salt is blended from chemically pure raw materials, continuously quality controlled, achieves elevated levels of calcium and alcalinity reserve without resorting to harmful chelating agents, contains all the essential trace elements and enhanced levels of Strontium and Iodine, dissolves easily and leaves no residue. Pack size: 20kg makes up approximately 600ltrs @35%o. MADE in GERMANY.