A salt system can always be added to an in ground pool. With some slight modifications to the equipment pad, the change is easily made.
With an above ground pool, the change can be added later as long as the pool was originally categorized as salt friendly. These pools are normally completely or mostly resin with very minimum hardware. You can read more about what makes an Above Ground Pool to salt compatible here!
In both cases, adding a sacrificial anode to protect the metal components of the pool, is highly recommended ESPECIALLY if you have a pool heater.
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