When does a water softener resin need to be replaced?
When the water does not become soft enough, one should first consider some adjustment. Resin manufacturers say that resin loss of 2.5 to 5% due to attrition can be expected. This means that a water softener that is 10 years old will be about 25 to 50% less efficient. Your water softener should be adjusted “down” by about 4% every year after the first 2 years. It should be considered that water softener resin be completely replaced after 12 to 15 years for optimum efficiency.