If you have a spa, contact the manufacturer to see if it will tolerate salt. If you are looking to buy one, try calling Spa Kingdom (or other supplier), and ask them about salt. The other option would be to try Google. IMHO, the spas are designed for the chlorine/bromine, and may not handle the corrosive properties of salt, especially the pump(s). Good luck with your quest.
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Pennsylvania, for 60+ years, most recently, Allentown, now TV. 
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