好像对健康不好哇。
Water Softeners
Household systems reduce the hardness of the water by replacing calcium and
magnesium with sodium or potassium, depending on the type of softener.
Installation of a water softener, however, is strictly an issue of personal
preference and should be done only out of aesthetic concerns, not because of
fears about water quality.
Advantages of water softeners include improved "feel" on skin when bathing,
longer life of appliances and reduction of water spots and deposits.
Disadvantages include potential health risks from sodium intake, harm to
houseplants due to elevated salt content and overload or reduced
effectiveness of septic systems.