Probably a false rumor, or, perhaps, a misinterpretaton.
I believe the pools (at least here south of 466) use a salt-based chlorination system rather than 'pure' chlorine. This results in less stinging of the eyes, a smoother feel on the skin, and less wear and tear on the swimsuits. Not exactly salt water but may be the genesis of what you heard.
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Maryland (DC Suburbs) - first 51 years 
The Villages - next 51 years 
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