Quote Originally Posted by JohnInSoCal
I would worry about an above ground pool though as you have metal and more salt means quicker corrosion. Any water is going to corrode metal, add salt and it will do it quicker.

-- john
Not any quicker than chlorine since it is the chlorine in a salt molecule that makes salt corrosive. Salt by itself is not corrosive. Salt has to react with something else (like certain kinds of metal) to be corrosive. When salt comes into contact with something that reacts with it, what happens is that the Na is split from the Cl in the salt molecule. When the Na is split from the Cl, it is the Cl that reacts to the world around it and corrodes metal. Since Cl is easily split from Na, that is the very reason that 'salt' is considered corrosive.

Pools are designed to be around Cl. All the metals in an above ground pool are designed to exist in a Cl environment. Simply adding NaCl to a Cl environment won't have any more effect on those metals than the Cl that is already in and around the pool. Make sense?