Essentials pro is a revolutionary care system. Our experience from more than 20,000 seawater analyses has enabled us to further optimize the recipe of the successful Essentials. Essentials pro supplies your aquarium not only with all major elements (incl. KH, Ca and Mg), but also with all essential trace elements (e.g. iron, iodine, molybdenum, manganese, vanadium and zinc) and helps to keep them continuously in the optimal concentration range.