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I have no idea what the brand/model is, the unit was in the house when we moved in 13 year ago and there's no ID on it.
Iron content according to different tests over the years varies from 3.02 mg/L...

Works good. Because of the amount of iron in our water it is set up to backwash every second night. It's about due for rebedding as it's been about 5 years since it was done.
We also have a water...

The link that jlisenbe posted shows basically what we have. The air injector is simply a venturi that the water goes through and draws air in to be mixed/absorbed by the water. The bypass valve...

Found it.
Turns out it was the air injector causing the noise in the line, there was no surging, just a noise that makes it sound like it's surging.
Thanks everyone for your suggestions and support.

Went and tried that, no water outside the bladder.

I erred when I said there was a pause between the surging sounds, there isn't.
It kind of sounds like this:...

Mostly in the pipe coming into the tank. With the cap off the well and listening down hole, I can just barely hear the pump running, nice and smooth, don't hear any of the surging that I hear in the...

[QUOTE][What size was the old pump?/QUOTE]
It was also 1/2 hp. I scraped the crud off the old pump yesterday and it was manufactured in 1973, Myers cat # 5B


Kind of hard to explain, it sort of...

Between the pump and the tank.

We put a new 1/2 HP submersible pump in our well about 3 weeks ago. It worked fine for about 2 weeks, then it started surging while it's running. When the pressure drops and the pump starts you can...