Old softener regenerates by timer-3 to 7 days, depends on setting. Current softener normally regenerates by meter-3 to 10 days depends on water usage and softener capacity. (水城百事)

by skyxu, Friday, February 24, 2012, 13:57 @ 水费双月100左右是不是太多了

Example: 40000 grain capacity softener. If hardness is 25 grain/gallon, the capacity of softener is 1600 gallon. If you use 200 gallon water per day, the softener regenerates every 7 to 8 days.