Alkalinity is a crucial parameter in the chemistry of water, particularly in aquatic systems such as coral reefs and aquariums. The most rigorous definitions of alkalinity are necessarily based on acid–base equilibria and represent the capacity of water to resist changes in pH by neutralising acids.

Alkalinity levels in the reefs and oceans around the world are significantly different from values that our aquariums are often kept at, with the minimum being around 5.79 dKH and the maximum of 7 dKH and if salinity is normalised to 35ppt alkalinity ranges from 6.415 and 6.44 dKH.

For multiple reasons including the above we recommend keeping alkalinity between 6.8 and 7 dKH.

For more scientifically proven information regarding alkalinity, its sources and other relevant information, please refer to our comprehensive H2P Methodology manual, which you can find at the link below.

10 mL of Reef Zlements KH Buffer increases alkalinity of 100 litres by 1dKH.

Available sizes:
​500ml Bottle
1 Litre Bottle
2.5l Jerrycan