I've kept boats and fished in salt water and it will wreck havoc on anthing that is not made for salt exposure, and even stuff that is made for salt is still affected by it. You really need to think twice about that.

If I had a concrete pool with steel re-bar I would never have gone this way just to make it feel better. Likewise if I had a heater ( I have plastic solar panels ) I would avoid it.

Just one man's 2cents worth.