Boron (B) is a macro element which is present in seawater as boric acid and borate. Unlike sodium, chloride, magnesium, sulphur, and other macro elements, it has a relatively low concentration of around 4.5 mg/L. Boron in seawater contributes to alkalinity and plays a significant role in regulating pH through its speciation between boric acid and borate ion.

Coral species such as Cladocora caespitosa and others exhibit a strong pH dependence on boron isotope compositions. This relationship helps corals regulate internal pH levels, which is critical for calcification processes.

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

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


20 mL of Boron Zlement increases the Boron concentration of 100 litres by 1 mg/L.


Available size: 1 Litre Bottle