We recently bought a house in which the previous owner had installed a Culligan softener system with not only brine and resin tanks but also a chlorine tank with a pump. There isn't a Culligan representative remaining within a 50 mile radius of the house, the ones outside of that range aren't willing to come without a huge fee (understandable) or at all.
The salt part is easy. What I don't know is what kind of chlorine solution or pellets or powder or [???] should I be adding to the chlorine tank? Google is usually my friend, but not on this issue. I don't want to just dump a bottle of Clorox in there, since I don't know (a) if sodium hypochlorite is the correct chemical for use in water treatment without poisoning us all to death, and (b) what other odd chemicals are in Clorox that will poison us all to death.
Our water is sourced from a well that is by itself fails on lead (0.023 mg/l) and is heavily laced with iron (20.4 mg/l). What can almost not be made out in the pictures below is a 10" carbon pre-filter (you can see the bottom sticking out from under the controller on the resin tank). The pre-filter does a pretty good job of removing the iron, though we have to replace it every 2 to 3 months.
There are two tanks that are obviously labeled Culligan; the third is of a slightly different color; no brand name on the tank itself, but written in blue ink are the words "gallon chlorine" (possibly a faded numeral before).
On the top of the tank marked "chlorine" is a pump: