Application: Iron-OX5
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Culligan Aquasential Select Plus & Select Series Iron-OX5 & Sulfur-OX3 Water Filters 01040683
Appendix A - Application: Iron-OX5
Water Quality
Verify that untreated water iron, pH, and alkalinity levels are within recommended limits.
Iron—A Common Water Problem
The chemical/physical nature of iron found in natural water supplies is exhibited in four general types:
1. Ferrous Iron
- also referred to as “dissolved iron” or “clear water” iron. The Iron-OX5 is rated to remove up
to 5 ppm of this type of iron. If a glass is filled with water containing ferrous iron the water will initially be
clear. Upon standing and being exposed to air the water will gradually turn cloudy and colored as the ferrous
iron oxidizes to ferric iron.
2. Particulate Iron
—Also called ferric iron. This type of iron is an undissolved particle of iron.
The Iron-OX5 filter will effectively remove these particles but it is not the intended design of the system.
If there is a significant amount of ferric iron additional filtration treatment may be required prior to the Iron-OX5.
3. Organic Bound Iron
—This type of iron is strongly attached to an organic compound in the water.
The oxidation / filtration process used in the Iron-OX5 will not remove this type of iron.
4. Bacterial Iron and Colloidal Iron
—These types of iron, like organic bound iron will not be removed
by the Iron-OX5 filter.
Principles of Operation - Iron-OX5 Aeration System
The Culligan Iron-OX5 system utilizes the principle of oxidation to convert ferrous iron to ferric iron, resulting in
removal of the iron as a filterable particle. The process is accomplished by water entering the filter tank being
immediately exposed to an “airhead” at the top of the filter tank to begin the oxidation process. The filter media acts
as a catalyst to help complete the oxidation reaction and retain the precipitated iron. Periodic reconditioning purges
the accumulated iron particles from the filter tank and re-classifies the media bed.
After the backwash cycle the Iron-OX5 control valve replenishes the airhead in the filter tank during the “Air Draw”
cycle. During this cycle air is educted into the filter tank in sufficient volume for the required airhead. During the
“Rinse” cycle the air charge is compressed and stored within the filter tank and the filter media is rinsed prior to the
system returning to the service cycle.
CAUTION!
Do not use where the water is microbiologically unsafe or with water of unknown quality without
adequate disinfection before or after the unit.
Pressure
- Although the system is designed and tested to operate at a maximum pressure of 60 psi, it is not expected
that the system should be exposed to such pressure for extended operation. Culligan recommends following the
IAPMO Uniform Plumbing code section 806.2 by installing a Pressure Regulating Valve if the water pressure is
greater than 60 psi. Operating on pressures above the UPC for extended periods of time can increase the service
frequency and failure of replacement parts. On a private water system, make sure the minimum pressure (when the
pump starts) is greater than 20 psi (140 kPa).
CAUTION!
The use of a pressure reducing valve may limit the flow of water in the household.
Temperature
- Do not install the unit where it might freeze, or next to a water heater or furnace or in direct sunlight.
Outdoor installation is not recommended, and voids the warranty and UL certification.
