Two thing to consider -
1) Does the softener operate on a timer or on specified amount of water that you use. The advantage of the second is that you don't have to worry about unplugging your softener when you travel. We had Kinetico which operated using the second method when we lived up north. It was still running after 25 years.
2) Some brands require the use of potassium chloride rather than sodium chloride. Since KCl is much more expensive than NaCl, you might want to avoid these brands unless the small amount of sodium in your diet is a big deal.
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