Thank you!!! What does the sulfate do? Does me having a vinyl liner help? I will use this one time, but will not use in the future. Thanks for letting me know and for the help as usual! You have helped me since day 1 through my CYA over 200 catastrophe from an inherited pool!
7.5 is a good target. If you miscalculated the pool volume, you've got plenty f wiggle room on either side.
Sulfites can damage saltwater chlorine generators and concrete. Your vinyl pool is in your favor. For me, I just don't like the idea of adding sulfur in any form. What conditions could cause it to start smelling? I don't know, and I don't wish to find out.