Pool Mate Spa Increase Calcium increases the calcium hardness in spas and hot tubs. The ideal calcium level for spas is between 150-300 parts per million. When calcium levels are too low, spa water can be foamy and corrosive to equipment. When calcium levels are too high, you will see scale formation on the spa's interior and the water will become cloudy. Use a test kit or test strip to test your spa calcium levels.
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