Pure calcium carbonate
Hydrocarbonate is a pure natural product. It is used in Calcium Reactors, and may be used in filters to increase the hardness of water, and as a substrate material in marine or Malawi/Tanganyika aquaria. A natural calcium-carbonic acid equilibrium is created in all aquariums with an alkaline pH value, and in a Calcium Reactor supplied with CO2, the hydrocarbonate is completely dissolved to calcium bicarbonate, becoming available for assimilation by hard and many soft corals, sponges, echinoderms, etc.
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