How Do I Properly Shock Chlorinate a Water Softner

Hello,

I read this thread, http://www.diychatroom.com/f7/dealing-iron-bacteria-stricken-water-softener-advice-39754/index2/ but still have questions about how to shock chlorinate my water softener but not my well.

System
I have a new house w/a new water treatment system. The system consists of a well (40 gal/min), continuous velocity pump (no pressure tank), water softener, two carbon tanks in parallel (to maintain pressure) and a UV light. I have R/O for the kitchen sink. I have a tankless water heater. The outside faucets pull water before any tx. System was installed 2/09.

Water Softener Hx
The water softener regenerates based on use and was not properly configured, e.g. I have not added any salt yet. The installer reset the parameters, e.g. water hardness and now it appears to be softening correctly.

Problem
When the water sits in the pipes for a time, e.g. overnight or while I'm at work, and I turn on the water, the water smells like sewer gas. I think it may be Hydrogen Sulfide that I am smelling. The smell is the same in hot or cold water. The smell dissipates quickly. There is no smell in the water from the outside faucet.

I "think" this means that the sulfur reducing bacteria are not in the well. That they are not in the water heater b/c I do not have one. I think they may be in the water softener.

Questions

If this is the case...

Q1) How much chlorine should I add to the tube in the salt tank to backwash the water softener?

Q2) Do I have to worry about this much chlorine affecting my septic system?

Q3) I should bypass the carbon tanks and R/O, correct?

Q4) I have a fish tank. How do I make sure I get all of the chlorine out of the salt tank and water softener?

Q5) I'm reading conflicting statements. Some say the active carbon removes chlorine but others say the shock chlorination will kill the carbon tanks. Do I only need to worry about the high chlorination? If so wouldn't people that automatically chlorinate their wells (chlorine pills) kill there carbon tanks sooner?

Q6) Is it possible that my carbon tanks are colonized in addition to or instead of my water softner?

Thank you very much for you help!