Quick take
Quality ion-exchange resin often lasts roughly 8–15 years in favorable conditions. Chlorine, iron, manganese and poor maintenance can shorten that substantially.
Typical lifespan
Residential softener resin commonly serves for many years before capacity declines enough to justify rebed or replacement.
Chlorine damage
Oxidizing disinfectants can degrade resin over time, especially at higher concentrations. Upstream carbon can reduce that exposure.
Iron fouling
Iron can coat resin and reduce exchange capacity. Dedicated iron treatment upstream is often better for high-iron wells.
Signs resin is failing
Hardness breakthrough despite correct settings, salt level and regeneration can indicate exhausted or fouled resin.