Every LFS uses different salt. I know Premier aquatics in Marietta used Fritz RPM and optimum aquarium in kennesaw uses TM (I think…) and Shaq’s reef in Marietta uses instant ocean... etc… etc…
When I first started this hobby, I was buying both RODI and mixed salt water from the LFS. Once though, they gave me RODI instead of salt water and I dumped it into my 65G Tank at the time. Realized they gave me a wrong water. I think she was just too busy maybe… No harms done but I learned that day it is good investment to get my own…
You also hear the story about their TDS being very high but I think LFS in atlanta are generally reliable~ Probably want to check your water before adding to the tank.