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Best location for chlorine injection in residential well water system

I'm repairing my home chlorination system. It's in place to deal with sulfurous water. As presently configured, the water comes from the well into the pressurizing tank (a captive air tank) then past the chlorine injection point and into a dwell tank of some 125 gallons. (After that, it passes to a dechlorinating column, then to the house.) The chlorine solution is injected via a peristaltic pump connected to the well pump, so chlorine is being added when the well pump runs, whether or not water is passing the injection point. (There's no expansion space other than the captive air tank.) Would it not be better to place the injection point ahead of the captive air tank so that there's always water moving there when the injector pump is running?

Andy Lyke
Retired electrical engineer, homeowner - Whitehouse, Ohio, USA
January 2, 2011

In the dark ages, the rubber in the air tank was frequently Buna, some grades of which do not like chlorine or chloride. So I will guess that is the reason that it was added after that tank. Modern elastomers might work. Why change it if it has worked for years?

James Watts
- Navarre, Florida
January 3, 2011