Hello, I recently started having a smell occur anytime running the hot water. I understand that this could be due to the anode in the hot water heater causeing a reaction with SRB's in the water. However my question is about how the bacteria could be in the water? The well is a fairly new well, I have been in the house for a little over 2 months and it was a new construction. I also I have a filtration system on the well, because I had an iron content of 1 ppm and also a presence of total coliform. The system consist of in order:

Chlorine Injection system
120 gal retention tank
Catalox Iron filter
Backwashing Carbon Filter

My well pump can produce 10 gpm.

Now finally for my quesiton. If my chlorination system is working correctly (I check it periodically and it maintains a Free chlorine of 1ppm) how would it be possible for bacteria to be getting through to cause the smelly water in the hot water heater? Thanks for any advice.