REEF building Sea Salt 285L/10kg. The new formula of Absolute Reef Sea Salt is the result of years of research into the physiological demands of corals in the reef aquarium environment and the growth, breeding of other marine living organisms around the world. It’s the ideal product for household saltwater aquarium tanks, as well asother big aquariums also recommended for breeding Brine Shrimp. The raw materials of all Absolute sea salts are selected from pure, food grade materials and contain all of the trace elements which are found in natural seawater. Other special vitamins and protective colloids are added to Absolute Salt to improve the immune functions of living marine organisms.