AquaVitro MineralizeAvailable For Pick Up & In Store Contact To Buy 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
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