So if the desired amount of FC (free chlorine) is 3ppm, and when you test your FC is less than that, does that mean you should add the correct amout of bleach to bring it back to 3ppm ?

For example lets say you had the following:

TC = 3
FC = 2
CC =1

This would suggest that the clorine is busy fighting something as the CC =1. In this case would you add enough bleach to bring the FC back to 3, thereby giving a TC of 4 ? or would you super clorinate, as you know the chlorine is currently fighting something ?

Thanks