Softeners not for health
As I understand it, water softeners are put in mostly to eliminate damage to the water system (scale buildup in pipes and water heater, stains in sinks and tubs) and to reduce the amount of soap needed (50% reduction?) for bathing, laundry, etc. Softeners specifically remove calcium and magnesium.
I have not heard that drinking the extra minerals is, in general, harmful to health.
Are you sure that the under sink units are not filters instead of softeners? There are many water conditions that require a filter or another type of treatment to make the water taste better or remove potentially toxic contaminants.
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