It is used in calcium reactors, calcite filters, bio filters and as substrate material in saltwater and Malawi/Tanganyikan aquaria. A natural calciumcarbonic acid equilibrium is created in all aquaria with an alcaline pH value and in a calcium reactor supplied with CO2, the hydrocarbonate is completely dissolved to calcium bicarbonate.
Hydrocarbonate is available in 3 grain sizes: fine (1 – 2 mm) for ‘hardening’ filters, medium (4 – 6 mm) for Calciumreactors, coarse (6 – 8 mm) as filter material.
