Aquasential® Tankless Reverse Osmosis System

Savor an unlimited supply of filtered water with the Aquasential® Tankless Reverse Osmosis (RO) Drinking Water Filtration System. This compact unit is equipped with innovative features that provide real-time water quality feedback and leak detection for even more peace of mind.

Ready for a drinking 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.


Discover Life-Enhancing Hydration

Family-Sized Filtration

Keep your household hydrated with up to 20x more water supplied daily than traditional reverse osmosis systems.

Planet-Friendly Hydration

Eliminate waste from single-use plastic bottles when you refill your cup right from the tap.

Space-Saving Design

The elegant, compact architecture makes this system an effortless addition to your home — no matter the size of your space.

Reassuring Replenishment

Enjoy peace of mind with every sip, knowing that your water has been filtered with cutting-edge technology.

No-Fuss Filtration

Our team of water experts thoughtfully crafted this tankless reverse osmosis system to include advanced filtration so you never have to think twice about your water quality.

Four-Stage Filtration Process

Reduce dissolved solids and​ particulates for cleaner, safer tap water you can trust.

2-in-1 Sediment and Carbon Filter

Address materials — like dirt, sand, and rust for a more refreshing water experience.

High-Capacity Solution

Tackle even more contaminants with a specialized, semipermeable membrane that provides comprehensive filtration.1

Carbon Block Filter

This final polishing stage targets any remaining bad tastes and odors so you can enjoy crisp, fresh-tasting water with every sip.

Take Filtration One Step Further

Culligan tankless reverse osmosis systems offer four stages of filtration and are certified to reduce the metals, salts and minerals in your water known as TDS (total dissolved solids). You can also enhance your system with these additional options

Premium Faucet

Choose from four modern designs in brushed nickel, chrome, matte black and bronze, and check real-time insights into water quality and filter life on the electronic display.

ClearLink PRO™

Instead of adding a second faucet, use your existing faucet and switch between RO and tap water at the touch of a button. The display also shares information on filter life and water quality.

Mineral Boost+ Cartridge

Upgrade the final stage with this option that includes carbon filtration and also adds calcium, magnesium and potassium for optimally alkaline, pH-balanced water.


Third-Party Certified

The Aquasential Tankless RO and Aquasential Tankless RO with Mineral Boost+ have been tested and certified by WQA against NSF/ANSI 372, CSA B483.1 and NSF/NSF 58 for the reduction of TDS as verified and substantiated by test data.​​ Learn more about product certifications here.

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


40 Billion+ Bottles Saved

Culligan water filtration solutions benefit the environment by reducing single-use plastic bottle waste and saving billions of bottles each year.


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.

  • System faucet, internal plastic components including system manifold, and fittings: Five-year warranty
  • Entire system: One-year warranty²

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.

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


Aquasential® Tankless RO System

Length x Width x Height

18.7 in x 5.7 in x 17.2 in

Power Specifications

Input: 120 VAC / Output: 24 VDC

Rated System Operating Pressure

15 – 120 psi

Inlet Water Temperature

41° – 100° F

Min. Product Flow Rate3

0.42 gpm

Daily Production Rate

715 gpd

Recovery Rate



Filter Cartridge


CF Composite Filter Cartridge

1 year or 4,755 gallons

RO Reverse Osmosis Filter Cartridge

600 gpd

CB Carbon Block Filter Cartridge

1 year or 4,755 gallons

MB+ Mineral Boost+ Filter Cartridge

1 year or 4,755 gallons

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.

What is the process for installing Culligan’s tankless RO system?​

Your local Culligan water experts make installation seamless. They’ll begin by connecting your drinking water filtration system to your water line and a nearby drain. Then, depending on your selection, your smart faucet or ClearLink PRO will be set up. Before leaving, your Culligan water experts will check the performance and show you how to operate the system, so you can enjoy life-enhancing water immediately.

With its compact design and unlimited supply, the tankless RO system is a great choice for homeowners and renters — as long as your landlord approves it. This system is also great for those who need a high volume of filtered water in commercial settings, even if you’re leasing a space.

Costs can vary depending on a variety of factors, including which accessories you select. After your local Culligan water expert tests your water and you determine the best solution for your home, they will be able to give you a customized quote for options to buy, rent or finance.

To keep your tankless reverse osmosis water system operating well, you should have your unit sanitized and your filters changed about once a year. Service frequency may vary depending on local water conditions and water usage. Your local Culligan water experts can do all of this for you; many offer service packages to make it even easier.


Additionally, the tankless RO system is equipped with automatic cleaning to keep your system performing well between annual visits. The unit may flush the RO membrane when powered up or it may clean the cartridges when inactive for more than two hours.

RO systems filter contaminants from water by forcing them through a semipermeable membrane to separate contaminants as small as a single atom. Most RO systems also include additional stages of filtration, including sediment and carbon filters. Unlike a traditional water filtration system for sinks, the tankless RO uses a booster pump and a high-volume RO membrane to provide an unlimited water supply — without the need for a tank.

The Aquasential Tankless Reverse Osmosis Drinking Water System is 18.7 inches in length x 5.7 inches in width x 17.2 inches in height.

Whether you have well water or municipal water, a reverse osmosis system is one of the best ways to treat drinking water for a broad range of potential contaminants. Depending on what’s in your well water, it may be advised to combine systems and solutions to provide higher-quality water. However, it’s best to start with a professional water quality test to decide exactly what your well may need.

Because it has a booster pump, the tankless RO is a great choice for providing unlimited filtered water in homes where water pressure is low.

As long as there is access to a cold water line, drain and electrical outlet, the tankless RO system can be installed anywhere. This can include a basement, crawl space or in an adjacent cabinet. The tankless RO system is especially useful for homes with high-volume water needs and light commercial settings.

What kinds of substances does this drinking water filtration system filter out?

The tankless reverse osmosis water filtration system can reduce many substances, such as dissolved solids and particulate materials like dirt, sand and rust. This innovative system can also address foul odors and tastes that these contaminants can cause. With the addition of the Mineral Boost+ filter, your system can also add in natural calcium minerals to create great-tasting, optimally alkaline, pH-balanced water.

When you purchase a tankless RO system from Culligan, you don’t just get top-quality drinking water — you also get expert installation and maintenance, industry-leading warranties, proven durability and a 30-day guarantee. With over 85 years of expertise and service, the team at Culligan can confidently guide you toward the right systems for your home and will be there through the life of your product, giving you peace of mind.

You can purchase replacement filters or parts through your local Culligan experts, who can also handle changing and maintaining them.

Yes – when you choose the ClearLink PRO wireless accessory to pair with your system, you can use your existing faucet and switch between RO and tap water simply with the touch of a button. Culligan RO systems are the only reverse osmosis systems that give you the choice to use your own faucet. With this option, you don’t need to drill additional holes in your countertop.

Installation costs will depend on where the system is being installed, accessory choices and other factors. To get more details about costs, please contact your local Culligan water expert for more information.

Yes, you can download the owner’s guide here:


Download Owner’s Guide

Culligan products are designed to be reliable and long-lasting, with industry-leading warranties. By following the recommended maintenance, you can expect the Culligan tankless reverse osmosis system and its components to last for many years.

The system is designed to be placed or mounted anywhere you have access to a cold water supply and drain line, and with a design that makes it easy to replace filters regularly without needing to move the unit from its position. Access to an electrical outlet is required, and local plumbing codes should always be followed.

Yes — the tankless RO can connect to your refrigerator’s water dispenser. It is recommended that you have a shut-off valve near the refrigerator connection for servicing. You can also connect your RO system to a standalone ice machine.

The RO system works great.

Our salesman came out and explained everything and we made a choice of systems. Great experience!

— Linda W, TX

Loved the service and the quality of the product.

Chris was amazing helping us figure out our water issues and coming up with the best solution.

— Shawn & Joanne H, WI

The quality of drinking water has improved significantly.

The staff was very kind and friendly and explained in detail about the RO system.

— Venkatesh I, SK

Let’s Get Started

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