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01x50g of CaCO3 eq = 0.1g or 100mg of CaCO3 eq Hence permanent hardness = 100mg/L or ppm ∴Temporary hardness= 300-100=200ppm. Why are hardness and alkalinity expressed as CaCO3? Both hardness and alkalinity are expressed as a concentration of CaCO3 for convenience of reporting a single number to represent multipleRead More →