Before going to live in France back in 2008 (now returned to UK), I was always getting summer colds. In France we had a salt water pool. While there and since, I have not had a cold, summer or winter (touch wood).
Although not sea water as mentioned and only small ppm of salt, I think using the pool has had lasting benefits - for me at least.
My father always used salt water for his catarrh (up the snozzle - not drinking) and said it was effective.
JJ.
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