2 pack of seachem fusion 2 part 500ml, 4 total bottles.

Reef Fusion 1 provides not only 100, 000 mg/L of ionic calcium, but also includes Biologically Appropriate levels of magnesium, strontium, boron, iron, MANGANESE, and molybdenum.

Reef Fusion 2 contains a mixture of carbonates and bicarbonates at an alkalinity of 4400 meq/L. It is designed to restore and maintain alkalinity in the reef aquarium and provide calcareous species with the essential carbonate needed for growth.