Aquasential® Select Plus Series® Sulfur-OX3® Water Filter

Refresh your home’s water and address rotten-egg smells with a sulfur filter that targets the hydrogen sulfide problems common in well water. This affordable system provides cleaner, crisp water without unpleasant odors.

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

Value Plus Performance

Targeted Filtration

Address hydrogen sulfide problems with natural aeration technology.

Exclusive Monitoring

Monitor daily water use and get advanced system diagnostics with Culligan’s unique Soft-Minder® Meter.

Zero Chemicals

Take comfort that operation and reconditioning are chemical-free with a process that naturally cleans your water.

Flexible Options

Choose from indoor or outdoor models to best fit your home.

Additional Features of the Sulfur Water Filter System

The sulfur filter system is more than just a water filter to remove rotten egg smell. With unique features and advanced technology, your home water experience will be better than ever.

Reliable Construction

Feel confident with a sturdy media tank with a filament-wound exterior and the smooth, non-permeable inner tank shell.

Bypass Valve

Save your treated water by putting your system in bypass for any uses that don’t benefit from filtered water, such as watering the lawn

Bypass Valve

Save your treated water by putting your system in bypass for any uses that don’t benefit from filtered water, such as watering the lawn


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

Culligan Aquasential Select Plus Sulfur-OX3 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 hydrogen sulfide up to 500 gallons as verified and substantiated by test data. The indoor systems are also certified to CSA B483.1. Learn more about product certificatio

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.

  • Fiberglass tank, control valve body, excluding internal parts and the filter tank: Ten years
  • The 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 Hydrogen Sulfide Filtration

3 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 the Aquasential Select Plus Series Sulfur-OX3 Water Filter good for well water?

Yes. This system is great for addressing moderate levels of hydrogen sulfide, which is commonly found in well water and can cause a characteristic rotten-egg odor. If you are dealing with more than one well water problem, you may require multiple solutions, such as a reverse osmosis system or a water softener. With a free, in-home water consultation, your local Culligan water expert can help determine what systems your home may need.

This sulfur water filter system is certified to reduce hydrogen sulfide. If you think you have other water problems, it is recommended to schedule a free, in-home water consultation, your local Culligan water expert to further examine your water problems. It is possible you may benefit from multiple systems, such as the Aquasential® Smart High Efficiency Iron-Cleer® Water Filter to address iron.

All Culligan sulfur filters address the signature rotten-egg smell that comes from high levels of hydrogen sulfide in water. This system is a great value option, while the Aquasential® Smart High Efficiency Sulfur-Cleer® Water filter includes more advanced technology and also tackles iron issues. It is recommended to schedule a free water consultation to find out more about your water problems.

How does the system filter sulfur out of water?

This sulfur filter uses an aeration process combined with a catalytic activated carbon filter to reduce hydrogen sulfide in water without using chemicals.

The main telltale sign of high levels of hydrogen sulfide in your water is a rotten-egg smell. In some cases hydrogen sulfide may also cause discoloration or strange tastes. Scheduling a free, in-home water consultation is the best way to determine what problems your water might have.

Yes. This system is environmentally friendly as it uses no chemicals to filter your water. Instead, it uses an aeration process which oxidizes hydrogen sulfide to a filterable state. Oxygen is automatically drawn into the tank during the regeneration cycle to replenish the air level to naturally clean your water.

I had a Culligan water system put in & there was no more sulfur smell & the water tasted much better.

It was well worth the money.

— Allen Z, NY

Immediately improved water quality & removed sulfur/rotten egg smell!

Easy start to finish process.

— Danelle F, CA

Great company!

Stupendous customer service from all staff and technicians.

— Matthew B, ON

Let’s Get Started

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