Calcion P is a high-purity powdered calcium supplement designed specifically for marine aquariums to boost the concentration of calcium in water, which is crucial for the health and growth of corals and other reef-building invertebrates. Formulated by a marine scientist, this product offers a stronger and more economical alternative compared to liquid solutions, making it ideal for hobbyists managing multiple reef aquaria. It is essential to measure the existing calcium concentration in your aquarium before using this supplement and to dilute the powder in water prior to application if live animals are present.