Over the years I've heard that you can't convert an existing AGP with Vinyl using standard chlorine to use an SWG, that the liner needed to be replaced prior to installing. I'm considering budgeting to add one next year and just wanted to see if the above is true or if there would be no issues with doing so. I'm slowly learning about Salt and like the idea of not lugging chemicals back to the pool every night, in addition to being able to go on vacation without worrying about someone adding bleach or having to use tablets. Thanks!