Salt is easier to maintain, which is the whole point of a salt water pool.
A salt water pool is chlorinated, just like a chlorine pool. The difference is where the chlorine comes from.
In a chlorine pool, the chlorine comes from you driving to the store, buying chlorine every week, and dumping it into the pool.
In a salt water pool, the chlorine comes from a magic box (essentially), that splits salt molecules...NaCl (sodium chloride) to sodium (Na) and...chlorine (Cl) . When the chlorine dissipates, it rejoins the sodium as NaCl, ready to be broken down into chlorine by that magic box all over again...in an endless cycle of magic chlorine generation.
Essentially, a salt water pool self-generates chlorine to self-chlorinate itself, eliminating one of the most burdensome aspects of pool ownership.
If you have not swam in a salt pool before, don't think of ocean water. A salt pool has a much lower concentration of salt, which is undetectable to most people.
Total cost of ownership is about the same. Every few years you will need to replace the magic box thing, which is priced similar to the price of the chlorine it can generate in it's useful life...so it is similar cost in the long run, but a properly adjusted salt pool is a lot less work to maintain.
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