Some people call it iron. Others call it rust, but if it produces a brownish-orange stain, it’s iron. Let me start by saying that there is “NO ONE BEST WAY!” How to best remove iron depends upon a number of other issues and levels of certain contaminants. To effectively remove iron you will need to apply the best method for your application. In order to determine the best method, we will have to have the answers to the following questions:
- What type of iron (Ferrous or Ferric) do you have and what is the level of iron?
- Is iron reducing (IRB) or sulfur reducing bacteria (SRB) present?
- Are there any competing contaminants (such as manganese or sulfur)?
- How many gallons a day will you be treating?
- What is the pressure and flow of water coming from your pressure tank?
What type of iron (Ferrous or Ferric) do you have and what is the level level of iron? While there are technically many types of iron, for our purposes we are going to deal with basically three types: Ferrous, Ferric and Bacterial. In this step, we are just dealing with whether your water is ferrous or ferric. Ferric iron is more difficult to remove in most instances, but both can be removed successfully. If your water is clear when it is drawn into a glass and then gradually turns color or get cloudy, it is most likely ferrous iron. However, if it is discolored when it is drawn, it is likely ferric.
It is also vitally important that you know the level of the iron in ppm (parts per million). The level and type of iron that you have is critical in applying the correct iron removal solution.
Is iron reducing (IRB) or sulfur reducing bacteria (SRB) present? If you look in your toilet tanks and see a brown, reddish or dark slime and stringy, gelatinous particles, then you very well may have bacterial iron or bacterial sulfur. You can test for this yourself with our BART Iron and Sulfur Reducing Bacteria Tests. Here is some helpful information about iron and sulfur reducing bacteria:
IRON RELATED BACTERIA – Iron Bacteria presents many problems, so an accurate determination of its presence is extremely crucial to pick the appropriate treatment. Iron Reducing Bacteria (IRB) cause aesthetic problems with the water such as taste, odor and staining of laundry and fixtures. The most common indication of iron bacteria in the water is a reddish-brown or yellowish gelatinous slime in water tanks, faucets, toilet tanks, and plumbing. These nuisance bacteria may cause corrosion to treatment equipment, clog screens and pipes, and have a foul odor. Here are a few of the common problems associated with Iron Reducing Bacteria:
TASTES AND ODORS – Iron bacteria often produce unpleasant tastes and odors commonly reported as: “swampy,” “oily or petroleum,” “cucumber,” “sewage,” “rotten vegetation,” or “musty.” The taste or odor may be much more noticeable after the water has not been used for some time. Iron bacteria do not produce hydrogen sulfide, the “rotten egg” smell, but do create an environment where sulfur bacteria can grow and produce hydrogen sulfide… thus creating the smell.
COLOR – Iron bacteria will usually cause yellow, orange, red, or brown stains and colored water. It is also sometimes possible to see a rainbow colored, oil-like sheen on the water.
RED SLIMY DEPOSITS – Iron bacteria produce a sticky slime which is typically rusty in color, but may be yellow, brown, or grey. A “feathery,” or filamentous growth may also be seen, particularly in standing water such as in a toilet tank.
The characteristics listed above are typical of iron bacteria. However, objectionable stains, tastes, or odors may be due to other causes including iron, sulfate, hydrogen sulfide, manganese, or other nuisance organisms such as sulfur bacteria.
SULFUR REDUCING BACTERIA – Sulfur-reducing bacteria (SRB) live in oxygen-deficient environments. They break down sulfur compounds, producing hydrogen sulfide gas in the process. Hydrogen sulfide gas is foul-smelling and highly corrosive. Of the two types, sulfur-reducing bacteria are the more common. The most obvious sign of a sulfur bacteria problem is the distinctive “rotten egg” odor of hydrogen sulfide gas. As with odors caused by iron bacteria, the sulfur smell may only be noticeable when the water hasn’t been run for several hours. In some cases, the odor will only be present when hot water is run; this could indicate that SRBs are building up in the water heater. Blackening of water or dark slime coating the inside of toilet tank may also indicate a sulfur bacteria problem.
Hydrogen sulfide gas produces an offensive “rotten egg” or “sulfur water” odor and taste in the water. In some cases, the odor may be noticeable only when the water is initially turned on or when hot water is used. Heat forces the gas into the air which may cause the odor to be especially offensive in a shower.
One of the many troubles with hydrogen sulfide is its strong corrosiveness to metals such as iron, steel, copper and brass. It can tarnish silverware and discolor copper and brass utensils. Hydrogen sulfide also can cause yellow or black stains on kitchen and bathroom fixtures. Coffee, tea and other beverages made with water containing hydrogen sulfide may be discolored and the appearance and taste of cooked foods can be affected. High concentrations of dissolved hydrogen sulfide also can foul the resin bed of an ion exchange water softener. When a hydrogen sulfide odor occurs in treated water (softened or filtered) and no hydrogen sulfide is detected in the non-treated water, it usually indicates the presence of some form of sulfate-reducing bacteria in the system. Water softeners provide a convenient environment for these bacteria to grow. A “salt-loving” bacteria that uses sulfates as an energy source may produce a black slime inside water softeners.
Sulfur-reducing bacteria, which use sulfur as an energy source, are the primary producers of large quantities of hydrogen sulfide. These bacteria chemically change natural sulfates in water to hydrogen sulfide. Sulfur-reducing bacteria live in oxygen-deficient environments such as deep wells, plumbing systems, water softeners and water heaters. These bacteria usually flourish on the hot water side of a water distribution system. Hydrogen sulfide gas also occurs naturally in some groundwater. It is formed from decomposing underground deposits of organic matter such as decaying plant material. It is found in deep or shallow wells and also can enter surface water through springs, although it quickly escapes to the atmosphere. Hydrogen sulfide often is present in wells drilled in shale or sandstone, or near coal or peat deposits or oil fields. Occasionally, a hot water heater is a source of hydrogen sulfide odor. The magnesium corrosion control rod present in many hot water heaters can chemically reduce naturally occurring sulfates to hydrogen sulfide.
Are there any competing contaminants (such as manganese or sulfur)? Not only do you need to know the level of the iron and if you have bacterial iron, but you also must know if you have manganese or sulfur in your water, and at what levels. Manganese is generally much more difficult to remove than iron, and hydrogen sulfide is even another animal. If you have iron along with manganese and/or sulfur the manganese and sulfur will interfere with the iron removal so that has to be a major consideration.
How many gallons a day will you be treating? If you have a three or four bathroom house with the average number of occupants, then you will like use 200 to 500 gallons a day. Not a big deal. But in some cases the need for water is a lot higher. For example, if you have an irrigation system, you may use up to two thousand gallons of water a day… and that’s a whole another issue. A few thousand gallons a day system has to be bigger and more robust than a system that uses just a few hundred gallons a day. Of course, commercial systems are different from residential systems, but some extreme residential applications need commercial systems.
What is the pressure and flow of water coming from your pressure tank? This is vitally important for two reasons (1) you want to have enough contact time to provide the “prolonged contact” necessary to remove the iron. In most residential applications, peak flow rates are seldom reached, but in irrigation and/or high usage applications you need to be careful not to exceed the peak flow. For example, if you have an irrigation system that uses 12 GPM and consumes 1,500 gallons a day, you would not simply want a 12 GPM filter. A better choice would be a 25 GPM filter… better yet – two 25 GPM filters. Remember, it’s Prolonged Contact that makes all the difference!
So, what system is best for you? At US Water, we gravitate to 21st Century Technology. This does not include what we consider to be old and outdated technologies, like Manganese Greensand (Greensand Plus), and Birm, as well as most manganese dioxide medias like Pyrolox, Filox and all the medias that end in “lox” except for Katalox Light, which weighs about half of what the other manganese dioxide medias weigh. What’s weight got to do with it? The heavier it is, the h
arder it is to backwash and the more water you waste. Katalox Light wastes about half the water Filox and Pyrolox waste and works as well… probably better!
The US Water Fusion Katalox Light Superfilter works on high amounts of iron and manganese and does not require an oxidizer. However, it you have hydrogen sulfide, iron bacteria or sulfur bacteria, this is not what you want to use. That’s why it is so vitally important to do a water test to determine if you have iron or sulfur bacteria. Katalox works on lots of iron and manganese (the caveat is that to remove high amounts of manganese, the pH should be over 8.0. If it is not, then you will want to raise the pH with a pH Booster System.
Next, we have the inFusion Purely O2 Superfilter which utilizes catalytic carbon and oxygen to oxidize iron, manganese and sulfur. Manganese is the most difficult for this method to remove, but iron and sulfur are where it shines. It easily handles up to 10 parts per million (ppm) of iron and 5 ppm of sulfur, but with the addition of our oxygen concentrator, which takes atmospheric air, which is 21% oxygen, and transforms it into 93% oxygen, which increases the oxidation capacity of the system and enables it to remove up to 30 ppm of iron and 30 ppm of sulfur. Best of all it still has no consumables or chemicals. This is by far, our most popular system. All it does is backwash every other day for a few minutes.
Finally, we saved our oldest (and most successful system) for last. This is our Fusion OXi-Gen Superfilter which utilizes a proportional injection system to inject hyd
rogen peroxide into the water just ahead of a catalytic carbon filter. The catalytic carbon acts as the catalyst between the iron or sulfur and the hydrogen peroxide (H2O2) to completely eradicate the iron and sulfur. Hydrogen peroxide (H2O2) is not really a chemical in the truest sense of the word. It is composed of the elements of water – hydrogen and oxygen and it generates no disinfection by-products. This is our most “forgiving” system in the sense that it always works. You just adjust the amount of H2O2 used. In msot cases, hydrogen peroxide use averages about $300 a year. That is the only drawback – you have an annual peroxide bill, but you will have wonderful water!
This table provides a summary of what might be best applied to different situations:
|
Fusion Katalox Light Superfiler |
inFusion Purely O2 Superfilter |
Fusion OXi-Gen Superfilter |
Type System
|
Chemical Free
|
Chemical Free Oxygen
|
Hydrogen Peroxide
|
Maximum Iron
|
50 ppm
|
10 ppm/30 ppm*
|
20 ppm
|
Maximum Manganese
|
3 ppm
|
1 ppm/2 ppm*
|
1 ppm
|
Maximum Sulfur
|
0 ppm
|
5 ppm/30 ppm*
|
50 ppm
|
pH Range
|
5-8
|
6-9
|
6-9
|
Iron/Sulfur Bacteria?
|
No
|
Yes*
|
Yes
|
Oxidizer
|
None
|
Oxygen
|
Hydrogen Peroxide
|
Media Life
|
10 years
|
6 years
|
6 years
|
Regen Frequency
|
2 days
|
2 days
|
2 days
|
*Maximum removal achieved with optional oxygen concentrator. |
Note: Another type of iron is colloidal iron which cannot generally be removed by conventional means. Our US Water Pulsar “Charged Media Filter” Charged Membrane Filtration or “CMF” is manufactured with Nano Alumina Fibers that have a Zeta potential of 51 millivolts. A CMF cartridge retains bacteria, virus, cryptosporidium oocysts and even tannin with its strong Zeta Potential, but most importantly to the instant discussion is that it retains iron. Sure, you could use it to remove all the iron, but it would plug very quickly. So, what you need to do is remove all the iron you can by conventional methods and the use the Pulsar Charged Media Cartridge.