Tropic Marin All-For-Reef revolutionized aquarium additive dosing with their original pre-mixed solution in an ultra-concentrated crystalline form that mixes easily at home. The powder contains key elements, including calcium, alkalinity, and trace elements, and it's a balanced source of calcium and carbonate hardness. Available in two sizes: 800g (makes 5 liters of solution) and 1600g (makes 10 liters).