Features Blend of divalent salts designed to restore or increase general hardness. Standard dose raises GH by 1 meq/L (2.8 dGH) Overview General hardness is the divalent metal cation content of the water. In most water this is comprised primarily of calcium and magnesium. Soft water has a low concentration of dissolved divalent cations, hard water a high concentration. The native environment of some plants ( Cryptocoryne , Aponogeton , etc.) is soft, whereas others ( Sagittaria subulata , Riccia fluitans , etc.) are more acclimated to hard water. In order to replicate these environments it may be necessary to adjust hardness. mineralize™ is a blend of divalent salts designed to restore or increase general hardness.