Reef Crystals is the first enriched seawater formulation to contain an extra measure of components important to reef aquaira: calcium, vitamins and trace elements. It also has a special crystal structure that makes it the fastest dissolving salt available, the only salt with a metal detoxifier.Reef Crystals synthetic sea salt is the first enriched sea water formulation to contain an extra measure of components important to reef hobbyists. Extra Calcium - many reef organisms form shells or skeletal structures by depositing calcium, which is removed from the water. Extra calcium has shown to be beneficial. The extra calcium in Reef Crystals can eliminate the need for separate calcium supplements. Extra Trace Elements - marine algae require numerous trace elements in solution. Extra trace elements, above natural sea water concentrations, in a long-lasting, chelated form, provide extended availablity. These extra trace elements can eliminate the need for additional trace element supplements. Animals such as corals and anemones that contain symbiotic algae in their tissues, will also benefit greatly. Vitamins - many of these same reef organisms also require vitamins for optimum growth and survival. The vitamin blend in Reef Crystals Enriched Salt is specially formulated to beefit the most sensitive organisms - algae, corals, anemones, and more. Metal detoxifier - a special additive helps detoxify excess heavy metals, such as copper and lead, that are often found at elevated levels in domestic water supplies.