We are in the process of talking to some builders for our possible new backyard pool, and a couple of them have differing opinions on chlorine vs salt water. The builder we visited with this morning is not a salt water fan, but will install a system if we choose to go that route, and will include the cost as an option in his price. He believes the salt would possibly have an effect on NEW concrete decking. He has been building pools for 40 years, and is highly regarded and recommended in our area, so I believe he is sincere in what he is telling us. We also really liked this builder, as he was more concerned about drainage and functionality, rather than trying to upsell us on bells and whistles. I have not heard of this problem from any of the posts I've read here, so wondered if it could be possible. He did say, however, that conversion to a salt water pool in the future would be easy if we chose to do so. If any of you have thoughts about this, I would appreciate input.