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Calcium Hardness refers to the measure of many dissolved minerals such as calcium, magnesium, sodium and iron. For practical reasons it is referred to as calcium hardness
Low calcium hardness can result in aggressive water that is highly corrosive.
Low Calcium Hardness
High calcium hardness can result in cloudy water, scaling, rough surfaces and clogged filters.
High Calcium Hardness
The desired calcium hardness level should be 200 - 400 ppm