I tested a system for our manufacturer a few years ago. You put 4 large bottles of a salt additive in initially and a bromine generator turned it into Bromine. It never functioned properly for more than a day or two, in spite of the manufacturer sending replacement parts for me to install to try and fix it. Wherever the water dried - steps, step in area, floor, it left behind a residue of salt crystals.
I wouldn't recommend it.