The lifespan of water-softening systems varies, but they typically last around 20 years with proper maintenance. Regularly replenishing the salt reservoir, cleaning the brine tank, and following the manufacturer's guidelines can extend the system's longevity. Factors like water hardness, system usage, and water quality also influence durability. Investing in a quality system and adhering to a routine maintenance schedule can ensure optimal performance and an extended lifespan for your water softening system.