Hi, Calcium and Magnesium ...

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Hi, Calcium and Magnesium both cause hardness, and because they are also cations they can cation exchange onto and off the exchange sites on natural zeolite. We've been using natural zeolites to take sodium out of solution and put calcium and magnesium back into solution; so the opposite of your problem. Natural zeolites have different cation selectivity preferences, you can find ones that have a very low affinity for calcium and magnesium. How are you regenerating your natural zeolite? How are you filters arranged? There are solutions to your problem.