Air Injection Revisited

Air Injection Revisited
Posted in: Iron Removal
By Mark Timmons
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It wasn't that long ago, December 27, 2018, to be exact, that I wrote a blog called The Truth About Air Injection Filters. In that blog, I wrote this:


That blog precipitated a lot of dissents, some of it actually very nasty, but I still stand behind what I wrote them... except that technology has changed. So, here I am writing this blog about a year and 5 months later because US Water Systems is now selling an Air Injection Iron Filter.

Before I really start, let me preface this with: "I know some of you have air-injection filters that you swear work really well." However, what works for you may not work for everyone. Air-injection iron filters DO NOT work on water that contains significant amounts of iron and.or iron or sulfur reducing bacteria... except ours. Here's are the facts:

There's not much else to say, except that just about every air injection iron filter is doing it wrong.

May 6, 2019
July 3, 2019 at 11:40 AM
how much hydrogen peroxide used on flexx oxi-gen aeration iron and sulfur filter the fx-150 and the fx-250 and where do you put it in top ? thanks Louis Bedard
Mark Timmons
July 18, 2019 at 10:01 PM
The answer is that it depends upon your water. It is fully adjustable and automatic, You do not put it in the top. It is connected to the control with a 3/8” line. In most cases, it will use 5-10 gallons a year.
October 2, 2019 at 5:56 PM
We are on a well and are struggling on what to do about several things. One being our iron level is .29mg/l and our manganese is .057mg/l So we are at the limits of doing something. A local company wants to sell us a water softening system saying it will take care of the iron and manganese while also correcting our hard water issue. Our water hardness is 50mg/l. He tested out at 120. DHEC and an independent water lab both come in at 50-55. The local company has a conflict of interest. I can't find anyone without a conflict of interest. DHEC says go with Greensand. You didn't mention manganese in your presentation, just iron and sulfur. Can you provide any feedback.
Mark Timmons
October 22, 2019 at 2:55 PM
I need a lot more info. PLase call in and ask for me.
October 10, 2019 at 6:42 PM
We have iron on our water, measured today at 1ppm, hardness 2gpg, ph6, total dissolved solids 38ppm. The well company is recommending Charger iron buster and softener with the air injection process you wrote about. With my numbers, would you say I am in trouble if I have them install an air injection water filter? Thanks!
Mark Timmons
October 22, 2019 at 2:54 PM
Unless it's like our OXi-Gen with the valve on the side, you will have problems. I would recommend the following: Step 1: Step 2: Step 3:
October 22, 2019 at 11:33 AM
I have a fine clay sediment issue and iron. I talked to a guy about a 1 1/2 micron mechanical self cleaning. Backwash filter and an aeration iron filter. Also looking at a salt free softener. What can you do for me?
Mark Timmons
October 22, 2019 at 11:44 AM
How much iron do you have? Are you sure it's not colloidal clay? I need to see a detailed water analysis in order to know what to recommend. Let me know how we can help.
February 26, 2020 at 12:29 PM
Hi Mark - I have 2.5 PPM ferrous iron and my pH is right at 7.0. I'm on a well that can pump 11 GPM. No manganese, no tannins. I've been removing the iron with my softener, but I'm tired of using atrocious amounts of salt and I still have some breakthrough. I'm ready for a dedicated iron filter ahead of my softener. I really like the side air injection system from a maintenance perspective and would be willing to get an air injection system now. I see you use catalytic carbon in these side air injection filters instead of the MnO2 media used in some other systems. Without adding H2O2 as an additional oxidizer, would your base side air injection system with catalytic carbon remove all of my iron?
Mark Timmons
March 15, 2020 at 12:27 PM
We have used the manganese oxide-based media many times, and in most cases, it is too problematic. As long as you do not have bacterial iron, the Oxi-Gen system should work fine. The nice thing is that later, you can add ozone or H2O2 injection during regeneration only.