Tropic Marin® Pro-Reef sea salt is specially designed for reef aquariums, containing optimal levels of calcium and magnesium to promote coral growth. Along with lower buffering and a balanced pH, this salt also helps stabilize natural water values for delicate marine life and enhances the solubility of all 70 trace elements. Ideal for use in regular water changes, starting a new aquarium, and restoring pH balance, this salt is the perfect foundation for the health and growth of fish, corals, and other aquatic invertebrates in modern reef aquariums. With its precise proportions of major and minor elements, this salt replicates tropical seawater and can be stored for several weeks before use. Simply dissolve 35 ml (approx. 37-40 g / 1.3-1.4 oz.) of salt per liter of water (or 0.5 cup / 140-150 g per US-gallon) and ensure a specific gravity of 1.025-1.027 at