If you put salt in a non-stick pot or pan and then add water and boil it on the stove, the salt will weaken the coating as it heats and dissolves.

@otto78
The way to add salt is to heat the water in the pot FIRST, then add the salt to the warm water so that the salt dissolves the instant it hits the warm/hot/boiling water.

Where the problem arrises with salt and non-stick teflon is if the salt is allowed to lie in the bottom of the pot un-dissolved in solid-form, even if there is cold water in the pot to start with.

The salt must dissolve on contact with the water which will only happen if the water is at least warm when the salt is first added.