We are replacing our vinyl liner and sand filter (c1993). We are strongly considering installing a SWG. Are there problems with salt and a vinyl liner (corrosion, holes, etc). I have no idea how the SWG works, but I understand you initially put in a lot of salt for the start-up. Any recs for type or brands of SWG? We will hire a pool company to do all the installs. Thanks for any advice.