Two things I would consider:
1) while most units use sodium chloride to regenerate, some use potassium chloride which is much more expensive. I see no reason to purchase a unit that uses potassium chloride.
2) If you are away from your home for long periods of time, consider a system that has dual tanks and regenerates based on the volume of water used rather than time based. Kinetico used to make systems like that performed very well in my home up north.
Finally, think carefully about where the drain tube is placed. Concrete doesn’t do well with sodium chloride over the long haul.
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“There is no such thing as a normal period of history. Normality is a fiction of economic textbooks.”
— Joan Robinson, “Contributions to Modern Economics” (1978)
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