Magnesium (Mg) in seawater plays several important roles in both biological and chemical processes. It is the third most abundant ion in seawater, after sodium (Na ) and chloride (Cl-), with a concentration of about 1,350 mg/L. Magnesium is a vital ion in seawater, with multifaceted roles in biological, chemical, geochemical, and ecological processes. It supports the health and functioning of marine ecosystems, influences the carbonate chemistry and mineralization processes, and plays a crucial role in maintaining the stability and productivity of the ocean environment. As per Reef Zlements mixing classification Magnesium is a Type C element. 10 mL of Magnesium Zlement increases the Magnesium concentration of 100 litres by 10 mg/L.
