Put any type of water treatment systems, such as water softeners, iron removing equipment, etc., on by-pass. Chlorine will cause these units to “plug-up” if not in the by pass mode. 
Shut off power to well. Remove well cap or seal from top of well casing. Submersible pumps may be suspended from some types of well caps and well seals. If you are unsure of the wellhead type, contact a pump installer or driller to chlorinate your well.
Slowly pour chlorine into well (approximately one(1) cup every two(2) minutes). Care must be taken to prevent chlorine solution from splashing and coming in contact with skin or eyes. It can be hazardous putting dry chlorine base products into the confined space of a well- a violent reaction may occur.
Once all chlorine is poured into well, wait 20-30 minutes for chlorine to settle in the well. Then turn the power back on to the well and attach a gardening hose to an outside spigot. With water running, place just inside to of well casing and run for 10-30 minutes or until the scent of chlorine is detected coming fromdischarge end of the hose, continue to circulate chlorinated water down well for an additional 15 minutes,washing the sides of the casing down. This indicates chlorine has circulated throughout the well system.
Now, with chlorinated water coming from the hose, rinse the inside of the well casing. This process will wash any bacteria down into the chlorinated water. Allow an additional 30 minutes of circulation.
Take off the screens on your faucets and open the cold water in the house (bathroom, kitchen, etc.) one at a time, until chlorine is detected. This will disinfect the plumbing system in your house. Chlorine should remain in the well for a period of 24 hours for bacteria or water quality problem & eight (8) hours after a well or pump system repair. Do not consume the water, do laundry, or bathe while chlorine remains in your system. Limited toilet flushing is permissible.
After the suggested time for disinfection has expired, run an outside hose to flush well free of chlorine. Do not run chlorine into your septic system. Run the water at a rate of approximately five(5) gpm (measure gpm with a five gallon bucket). Run water away from any vegetation.
Clearing well of all traces(odor) of chlorine can take from 3 to 48 + hours. For the next few days you may notice some discoloration & particles in the water. This is normal and will normally clear with water usage. After flushing all chlorine & sediment from the well, you may switch off the softener by-pass.
