Have Salt Systems fallen out of favor?

[chem geek]

Keep in mind that the problems aren't just having saltwater splash out onto softer stones, but also having fast enough evaporation and not having summer rains dilute the water. It's the combination of splash-out and evaporation that leads to salt recrystallization pressure that puts stress on softer stone. This is probably why more problems are seen in dry and hot Texas compared to wet Florida, for example. The local stones used also matter and some builders use materials that would be a problem for a non-salt pool as well, though it may take longer to notice in such a pool.

[rpoldervaart]

It's the combination of splash-out and evaporation

Ahh. That helps explain some things. My neighbor and I both have salt pools and natural rock. We were noticing that the rock under the water line (along his water line and under my water line under the falls) was not deteriorating noticeably.