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The total volume of a CH system is about 80 li. To fill that for a year might use 8 li at the most.
That is insignificant in water usage!
I'm not saying that its a significant amount of water, but why cause the softener to regen more often by wasting soft water and adding salty water into a system filled with steel. Watering my garden with softened water would cost pennys but I still don't do it because there's no need. The same reason why you don't boil a full kettle to make 1 cup of tea, to save a minuscule amount of electric.
Each to their own I suppose.