This really depends on the level of use. The biggest advantage of a saltwater pool is that it reduces your chlorine exposure. First of all, this prevents the "chlorine hair" phenomenon that serious swimmers know only too well, as well as reduces eye irritation. For young swimmers, this can be really important, as that eye irritation can make them unwilling to put their head under water and learn to swim properly. It's also better for your swimsuit—overexposure to chlorine can cause more wear and tear over time.