Tropic Marin All-For-Reef revolutionized aquarium additive dosing with their original pre-mixed solution, and now this same formula is available in an ultra-concentrated crystalline form that you can easily mix at home, making it more economical for systems of all sizes. All-For-Reef powder contains all key elements, including calcium, alkalinity, and trace elements. It mixes easily with RO/DI water to make a single, complete additive solution. Its no longer necessary to maintain two, three, or four solutions, or a complicated reactor. All-For-Reef is a balanced source of calcium and carbonate hardness, released through natural biological processes, along with a mix of trace elements. No mixing, no gas cylinders, no fuss.