Calcium is naturally present in water. It may dissolve from rocks such as limestone, marble, calcite, dolomite, gypsum, fluorite, and apatite. Calcium is a determinant of water hardness because it can be found in water as Ca2+ ions and may negatively influence the toxicity of other compounds. Elements such as copper, lead, and zinc are much more toxic in soft water.
In limed soils, calcium may immobilize iron. This may cause iron shortages, even when plenty of iron is present in the soil. Water hardness influences aquatic organisms concerning metal toxicity

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