True salt water pools have the same parts per million (ppm) as sea water which is roughly 35,000 ppm. We have a salt taste threshold of around 3,500 ppm and our eyes have about 7,000ppm. Most chlorine generators require a salt content of 3,000-5,000 ppm in the pool. You will feel the salt in a true salt water pool, most people don't notice the salt in a pool with a chlorine generator.
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The mineral salts in a salt water pool irritate the eyes. It usually only happens if soemone is very sensitive or there are too many salts in the pool - yes there are different types of mineral salts available and can be in too much of a concentration.
Salt water pools are really saline pools. The salt content is much less than natural sea water. You can barely taste the salt in the pool.
Chlorine pools hurt your eyes , while salt water pools do not.