Replenishes Calcium, Carbonate Alkalinity, and Essential Trace Elements

Reef Endurance Calcium reactor media is natural aragonite rubble from sustainably harvested fossil corals, collected and cleaned for use as the sole media for calcium reactors to support rapid coral growth. Large 4-6mm rubble is the perfect grain size to prevent compacting and channeling making it an ideal media for all calcium reactors. Available in small 3-4mm and large 4-6mm grain sizes.