Calcium (Ca) is a crucial element in seawater, vital in various biological and chemical processes. It is essential for the formation of skeletal structures in marine organisms, especially corals, molluscs, and certain types of plankton. Calcium also interacts with the carbonate system to regulate the chemistry of seawater.

Calcium levels are critical for the health and growth of hard corals, as they are essential for the process of calcification, where corals build their calcium carbonate skeletons. Variations in calcium concentration can significantly affect coral growth, skeletal density, and overall reef-building capacity.


As per Reef Zlements mixing classification Calcium is a Type C element.

For more scientifically proven information regarding calcium, please refer to our comprehensive H2P Methodology manual, which you can find at the link below.

10 mL of Calcium Zlement increases the Calcium concentration of 100 litres by 20 mg/L.

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Available size: 1 Litre Bottle