Aquasential® Select Plus Series® Iron-OX5® Water Filter

Get better water and a cleaner home with just one system. This iron filter for well and city water prevents rust stains, limits plumbing clogs and improves water quality — all with an environmentally friendly, affordable design.

Ready for a whole home water upgrade? Your local Culligan® water experts can help determine the right solution for your municipal or well water. Schedule your free, in-home water test or phone consultation to get started.

Sustainability Plus Convenience

Chemical-Free Filtration

This iron water filter system uses a natural aeration process to treat your water without the need for chemicals.

Flexible Fit

Space-Saving Design The Iron-OX5 system automatically keeps the aeration process active in a simple, single-tank design.

Advanced Monitoring

Hassle-Free Monitoring The exclusive Culligan Soft-Minder® meter monitors daily water use and provides advanced system diagnostics.The exclusive Culligan Soft-Minder® meter monitors daily water use and provides advanced system diagnostics.

Flexible Locations

Choose between indoor and outdoor models for your needs.

More Features for Better Filtration

With an iron filter for home use, you’ll enjoy thoughtfully designed features, reliable functionality and a virtually limitless supply of better water without the hassle.


Reliable Construction

A sturdy media tank and a smooth, non-permeable inner shell make the Iron-OX5 highly durable.

Unrivaled Control

The bypass valve allows you to avoid waste in areas that don’t need filtered water — like your lawn.

On-Demand Insights

An easy-to-read, backlit display lets you know your whole house iron water filter is working and warns of system malfunctions.


100% Satisfaction Guarantee

If you are dissatisfied with your Culligan product for any reason within 30 days of your purchase, Culligan will remove the product and refund the purchase price.


Third-Party Certified

The Culligan Aquasential Select Plus Iron-OX5 water filter systems have been tested and certified by WQA against NSF/ANSI Standard 372 and NSF/ANSI Standard 42 for the effective reduction of iron up to 500 gallons as verified and substantiated by test data. The indoor system is also certified to CSA B483.1.

Ready To Take the Next Step?

Schedule a free, in-home consultation and water test to get one step closer to the soft water your family deserves. With options to buy, finance or rent, your local Culligan water expert will make recommendations based on your home, water usage, test results and any other concerns.

Our Environmental Impact


World’s Most Efficient

With patented technology, Culligan’s Smart HE Water Softener saves on salt, water and electricity usage, reducing operating costs by up to 46%.³


Earth-Conscious Innovation

We prioritize sustainability in designing and developing new products.


Global Water Leadership

Culligan has joined the CEO Water Mandate and the Water Resilience Coalition to lead the way in positive, global water stewardship.


Culligan products are reliable and long-lasting, with industry-leading warranties.

  • Control valve body, excluding internal parts and the filter tank: Ten-year warranty
  • AccuSoft® circuit board and Soft-Minder® meter, if so equipped: Five-year warranty
  • Entire system: One-year warranty

To access customer support, call your local Culligan water expert or​ fill out this Maintenance & Support form​.

Product Specifications


Media Tank Size

10” x 54”

Overall Height


Water Pressure Limits

20 – 60 psi

Temperature Limits

33° – 120° F

Electrical Requirements


Product Details


Maximum Rated Service Flow @ Pressure Drop¹

6 gpm @ 9 psi

Operating Pressure

20-60 psi

Maximum Clear Water (Soluble) Iron

5 ppm

Our unmatched, white-glove service doesn’t stop at your free water test and consultation. Your local Culligan water experts will be there to help for the entire life of your water softener with installation and maintenance, assisting with needs such as salt refills, system sanitation and more. They can even monitor your system proactively for issues, offering you further peace of mind.


Convenient Service Plans

Sign up for our regular salt delivery and maintenance plans so you never have to worry about your system’s performance.


85+ Years of Experience

With over 85 years of water treatment experience, you can count on us to provide the solutions and service you need anytime.


Unwavering Local Support

Our team of experts knows your local water and is there to offer support and services right in your neighborhood.


Flexible Installation Areas

Your system can be installed anywhere you have access to main water piping, a drain and an electrical outlet — in the laundry room, basement, garage, or outside.

Is this whole house iron water filter environmentally friendly?

Yes. The Iron-OX5 doesn’t use chemicals during the filtration process. Instead, it relies on natural interactions between oxygen and iron to help filter your water. That means this iron filter for home use may be more environmentally friendly than other potential solutions.

Instead of relying on chemicals, the Iron-OX5 uses an environmentally friendly process called aeration. The aeration process oxidizes dissolved iron, turning it into filterable particles. The media in the tank acts as a catalyst to enhance the reaction between the oxygen and iron. A second layer of Culligan G-50 media ensures efficient filtration of the iron particles.

Although there are DIY tests available for iron content in water, the easiest and most reliable way to get detailed information is to have a professional water test and consultation. You won’t have to perform or interpret the test yourself — and, better yet, your local water expert will give you information on other potential water concerns and solutions at the same time.

How long does this iron water filter system last?
The lifespan of any iron filter for well and city water depends on various factors, including your water usage, iron levels and more. However, this system has a durable design that improves its longevity, including a sturdy fiberglass media tank with a filament-wound exterior and non-permeable inner tank shell designed for years of continual service.

Yes. The Iron-OX5 is designed to target and address iron content in tap water — a particularly common issue for homes with wells. Iron is a naturally occurring element in soil, rocks, minerals and even the Earth’s crust. That means it can easily find its way into groundwater — the source of many private wells. As a result, well water may frequently cause rust-like stains, reduced appliance lifespan and efficiency, plumbing clogs and other frustrations. The Iron-OX5 addresses all these problems and more.

Water filtration and softening are two separate processes. Although this whole house iron water filter can address some of your top water frustrations, such as staining and clogging, it won’t fix hard water issues like mineral buildup or soap spots. Fortunately, water softeners can work side-by-side with your iron water filter system, creating even more benefits for your home, budget and well-being. Together, they’ll create a water supply that’s soft, cleaner and easier on your appliances (and your skin and hair, too).

The Culligan team is always prompt, polite, friendly and professional.

They answer all of my questions and they are always respectful of my home.

— Debra M, MI

We could not be happier with the quality and great taste of our water!

Culligan is always quick and efficient, plus the staff has helpful answers about products and services.

— Thomas J, WA

I’m so happy we chose Culligan.

We had severe problems with our well water and after we got the new filtration system installed, it’s like magic – all the issues just disappeared.

— Puja C, AB

Let’s Get Started

Start enjoying the benefits of soft water in your home with help from your local Culligan water experts.