Iron Reducing Bacteria

already and that lasted 2 days and the smell came back. We called

My understanding is that the bacteria are not
a significant health hazard, but the slime and odor
they produce are certainly an annoyance.

I tried shocking the well several times and almost
succeeded in blocking the (submers) pump inlet(!)
with their goop.

Experimenting, I found that adding bleach directly
to the water after it entered the house piping
eliminated both odor and slime.

Next step was to build a homemade chemical injection
system. I bought a (used) precision lab pump made
for these applications and piped it into my well pump
bladder tank. The feed pump is supplied with dilute bleach
and runs for a brief period when the well pump starts up
each cycle.

This system has worked flawlessly for the last 5 years.

Culligan and they stated that the problem could be very serious as the
smell came back so quick after bleaching.

My understanding is that IRB (Iron reducing bacteria) can render a well
system useless very quickly.

Can anyone suggest a course of action to deal with this. The builder
says that its not his problem.

I'd get in touch with the health authorities about the potential health
risks and what, if any, responsibilities are those of the builder.

There are no health problems; the water just tastes lousy.
I have the same problem. A carbon filter lasts a couple days.
The only real fix is pretty expensive. I have stopped noticing it, but my
wife hasn't.