ReBorn is composed of the fossil sheletal remains of reef building corals sustainably harvest from prostone sites in the Western Pacific Ocean. When used in a calcium reactor where it is dissolved with CO2 ReBorn not only replenishes calcium and carbonate alkalinity, it also replenishes strontium and trace elements in the same proportions they are used by corals to build their skeletons. In this way ReBOrn replaces exactly what corals need to grow.