Stay with info here and don't mix. FC is safe if above min and up to SLAM level, for equipment and humans. I run mine 10-12, I have 4 grandkids. I would never let them near the pool if it wasn't safe.
It's actually less safe to have them in at low levels. We had one pool this week that was at minimums, had a log swim session, likely went below sanitizing level, and two kids got diarrhea. They raised there FC back up, next swim no diarrhea.
If you *really* want to dive into the deep end. Have at it...Link-->
Pool Water Chemistry
Trust me, it's safe...