An agent to maintain constant levels of calcium in coral reef aquaria. Dissolve 50 g of the product and 10 g of Magnesium Aquaforest in 1000 ml of deionized water. To maintain ion equilibrium, use KH Buffer and Reef Mineral Salt Aquaforest products as well. The recommended calcium level in coral reef aquaria is 400-440 mg/L. 10g Calcium in 100l of water increases by about 35 mg/l (ppm ) calcium levels. 100ml Calcium solution increases by about 17,5mg/l (ppm) in 100L of water. US: 13 tbsp of the product and 2.4 tbsp of Magnesium Aquaforest in 1 US gal. of deionized water. Contains CaCl2.