Kent Marine Sea Salt is top quality sea salt for the manufacture of sea water for your aquarium. Kent Marine Sea Salt contains enhanced buffer levels and enhanced levels of important minerals, such as calcium, strontium, iodine, iron, cobalt, rubidium, lithium and many others. Kent Marine Sea Salt also contains Kent Marine's Coral-Vite technology which provides all of these minerals plus vitamins to meet the exact requirements of your marine invertebrates. Please refer to the product guidelines for the amounts to use.