Here is an interesting discussion about salt water pools:

TO SALT OR NOT TO SALT!

Everyone loves salt water pools, but they are not “Chemical Free” as claimed. Salt in water is corrosive (just like the ocean water) and makes keeping your pool’s pH low a bit of a challenge. Many pool owners are not willing to test the pH several times a week to keep it under 7.8.
Salt adds TDS to the pool water as well as iron.

If you do decide to go with a salt system, place a CuLator Metal Eliminator Ultra 4.0 in the pump basket every 4-6 months to bind the iron from the salt out of the water. That way, you will prevent metal stains even if the pH climbs up by using salt.

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