Dunno.
Most of the problems with deck damage from salt seems to occur in areas where (a) natural stone is used and (b) there's not much rain.
If the builder installed BOTH the pool and the deck, I'd get him involved: he's responsible regardless.
If you want to experiment, you can pick an inconspicuous area, and repeatedly pour concentrated salt solutions (1/4 cup of salt in 1 gallon of water) and see it accelerated damage occurs there.
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