Aqua recommends chlorinating your well as the first step in trying to remedy an unsafe sample, high iron, iron bacteria, hydrogen sulfide & anytime the well is entered for service.
Warning: It is recommended a licensed pump installer chlorinate water wells. Do not attempt if the pump or piping is connected to the well cap or if you have a flowing well or pressurized well head. Calcium hypochlorite is a hazardous material and can cause severe injury, it is extremely important to handle with caution & care. Chlorinating wells in most instances, is an effective means of disinfecting a well. Under certain conditions, obstructions, corrosion & pump failure can occur in the well & plumbing system.