Reef Code A, the ultimate calcium supplement. Use with part B to provide carbonates and other anions to achieve a balanced and thriving aquatic environment. Reef Code A & B is an innovative two-part solution that redefines calcium and carbonate dosing for your reef aquarium. Achieve a harmonious aquatic environment with natural seawater ratios, fostering optimal conditions for the growth of corals, clams, and reef-building organisms. Overview NATURAL SEAWATER RATIO - Reef Code A offers the calcium component of a two-part dosing method for calcium and alkalinity. It maintains ionic balance by matching natural seawater concentrations of calcium for aquarium and carbonates, when used with equal parts Reef Code B.• CALCIUM & MULTI-MINERAL SUPPLEMENT MARINE AQUARIUM - Benefits reef-building organisms like corals, clams, and calcareous algae. It supplies all the necessary essential elements for their growth, simultaneously simplifying the maintenance of aquarium calcium and alkalinity.• STRENGTH ADVANTAGE - Reef Code A contains major minerals such as calcium, magnesium, strontium, and potassium as well as minor and trace minerals. It provides a more robust and effective performance in maintaining the desired reef aquarium conditions and a more vibrant reef. Use with Reef Code B for optimum results.• AMERICAN-MADE EXCELLENCE - Brightwell Aquatics is an industry-leading brand committed to providing innovative and scientifically backed aquatic care products. Made in the USA, we consistently deliver advanced, superior-quality solutions to elevate the vibrancy and health of your aquarium.