An agent to maintain constant levels of magnesium in coral reef aquaria. Dissolve 10 g of the product and 50 g of Calcium Aquaforest in 1000 ml of deionized water. To maintain ion equilibrium, use KH Buffer and Reef Mineral Salt Aquaforest products as well.10g Magnesium in 100l of water increases by about 12mg /l (ppm ) levels of magnesium.100ml Magnesium solution increases by about 1,2mg/l (ppm )in 100L of water.The recommended magnesium level in coral reef aquaria is 1280-1380mg/l. Contains MgCl2x6H2O. US: 2.4 tbsp of the product and 13 tbsp of Calcium Aquaforest in 1 US gal. of deionized water.