Mundi Acuario :: Todo sobre la mascota , peces , acuarios , discos. Acuariofilia :: Índice. Página principal. Water Hardness in the aquarium. The hardness of water is related to the dissolved minerals in contains. The total hardness is usually regarded as consisting of two components: general hardness (GH) and carbonate hardness (KH). General hardness is caused by divalent metal ions, primarily calcium and magnesium. Carbonate hardness is due to carbonate/bicarbonate ions, and represents the main 'buffering capacity' of the water, i.e. its ability to resist pH changes.
KH and pH are therefore inter-related: if KH is high, the pH will be very stable (and difficult to alter), if KH is low (e.g. less than 3 degrees KH) then the pH will be less stable. Carbonate hardness is sometimes referred to as 'temporary' hardness, because it can be removed by boiling, which precipitates the carbonates. Increasing hardness is normally fairly easy. Decreasing hardness can be done in two main ways: dilution with softer water, or adsorption of hardening ions. Note that normal table salt (sodium chloride), does not increase hardness.
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