Aquasential® Reverse Osmosis Drinking Water Filtration 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.


Upgrade to an Advanced Reverse Osmosis Filter

Unlimited Filtered Water

Depend on a virtually endless supply of high-quality drinking water that costs just pennies a glass.

Impactful Waste Savings

Help reduce oil, gasoline and waste from the production, transport and disposal of single-use plastic bottles.

Trustworthy Water Quality

Feel assured that your family is hydrating with safer water through a system that’s certified to reduce over 70 contaminants.

Fresher Smell and Taste

Get crisper, cleaning water for both cooking and drinking right from the tap.

Comprehensive Contaminant Reduction

Customize your Culligan reverse osmosis water filtration system to your needs with up to seven stages of filtration and 14 filter options. Our RO system is certified to reduce over 70 contaminants, including viruses, bacteria, mercury, arsenic, PFOA/PFOS and lead, as well as 15 emerging contaminants.



















Heavy Metals



Customized Filtration to Fit Your Needs

All Culligan RO systems include drinking water filters that provide multiple stages of filtration. The core levels of filtration are the sediment/carbon pre-filter, the RO membrane and a post-filter, which provides comprehensive protection against a broad array of issues including total dissolved solids (TDS), heavy metals, chlorine, lead and more. You also have a choice of one- or two-year filters. Additionally, you can enhance your system with these options:

Total Defense Cartridge

Add an extra layer of filtration for pharmaceuticals, mercury, VOCs (volatile organic compounds), pesticides and more; you can also choose a Total Defense Cartridge with Mineral Boost.

Advanced Post-Filter

Expand protection to address bacteria and viruses; this filter is a particularly good option for well water.

Arsenic Filter

Focus on reducing arsenic in your water in areas where this issue is more significant.

Mineral Boost Cartridge

Add natural calcium minerals back into your water for great-tasting, optimally alkaline, pH-balanced water.

Premium Faucet

Choose from four modern designs in brushed nickel, chrome, matte black and bronze, and feel confident with every sip with real-time insights into filter life right from the optional integrated monitor light.

ClearLink PRO™

Instead of adding a faucet, use your existing one and switch between RO and tap water at the touch of a button with our proprietary wireless technology.


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 RO® system is tested and certified by WQA to NSF/ANSI 58, NSF/ANSI 42, NSF/ANSI 53, NSF/ANSI 401, NSF/ANSI 372, CSA B483.1 and NSF Protocol P231 and conforms to these standards for specific performance claims 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.

  • Molded system manifold: Lifetime warranty
  • RO tank and all other parts of the RO system: 10-year warranty
  • Faucet with display, rechargeable battery pack, PCBs and associated LEDs and displays: Five-year warranty​
  • Filters and membranes: One-year warranty

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

Product Specifications

Aquasential® RO Water System

Length x Width x Height

19.0 in x 5.7 in x 17.8 in

Power Specifications


Rated System Operating Pressure

40 – 120 psi (276-827 kPa)

Inlet Water Temperature

33° – 100° F

Daily Production³

50 gpd²

Recovery Rate


Storage Tank Capacity

3 Gallons

Filter Position

Filter Cartridge



Sediment / Carbon Combination Pre-filter

1 or 2 years


RO Membrane

5 gpd³


Specialty Total Defense⁴
Specialty Total Defense with Mineral⁴
Specialty Remineralization
Specialty Arsenic⁴

1 year or 1,000 gallons / 2 years or 2,000 gallons


Post-filter, 1 year
Advanced Post-filter (P231)⁴

1 year or 1,000 gallon / 2 years or 2,000 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.

Does this reverse osmosis water filtration system work for well water?​

Yes, our reverse osmosis system is not only a highly comprehensive method for treating drinking water, capable of addressing a wide range of potential contaminants, but it also offers several distinct advantages for well water users. Particularly for well applications, where concerns about viruses and bacteria are more prevalent, the system’s P231 certification for reducing these issues provides reassurance

Yes – RO water systems aren’t just for homeowners. They can be purchased, rented or financed.  For home or apartment renters, we recommend renting your system — just be sure to get your landlord’s approval first.

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

You can install your system anywhere you have access to a cold water line and drain, including in another kitchen cabinet, in a crawlspace or in your basement or garage.

Our reverse osmosis system is certified to reduce over 70 contaminants, including viruses, bacteria, mercury, arsenic and lead, as well as emerging contaminants.

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

What can I expect from reverse osmosis filter installation?

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

Download Owner’s Guide


The product is totally reliable and the service is second to none.

We have been using the Culligan RO system for over 25 years and just installed one in our 3rd home.

— David L, ON

My Culligan RO system works really, really well.

Best tasting water, coffee, food prep … Won’t change back to faucet water ever.

— Tony B, FL

Good tasting water. Reasonable filter price. Reliable service.

Never had issues with the RO unit.

— Benjavan U, RI

Let’s Get Started

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

Contaminants Reduced

  • Aesthetic Chloramine
  • Aesthetic Chlorine
  • Alachlor
  • Atrazine
  • Bacteria
  • Barium
  • Benzene
  • Bromochloroacetonitrile
  • Bromodichloromethane
  • Bromoform
  • Cadmium
  • Carbofuran
  • Carbon Tetrachloride
  • Chlorobenzene
  • Chlorodibromomethane
  • Chloropicrin
  • Copper
  • Cyst
  • 2,4-D
  • Dibromoacetonitrile
  • Dibromochloropropane
  • 1,1-Dichloro-2-propane
  • O-Dichlorobenzene
  • P-Dichlorobenzene
  • 1, 2-Dichloroethane
  • 1, 1-Dichloroethylene
  • Cis-1,2-dichloroethylene
  • Trans-1,2-dichloroethylene
  • 1,2-dichloropropane
  • Dinoseb
  • Endrin
  • Ethylbenzene
  • Ethylene dibromide
  • Fluoride
  • Heptachlor (H-34, heptox)
  • Heptachlor epoxide
  • Heptachlorobutadiene
  • Hexachlorocyclopentadiene
  • Hexavalent Chromium
  • Lead
  • Lindane
  • Mercury
  • Methoxychlor
  • Methyltert-butylether (MTBE)
  • Nitrate
  • Nitrite
  • Particulate Class I
  • Pentachlorophenol
  • Pentavalent Arsenic @50 ppb
  • PFOA
  • PFOS
  • Radium 226
  • Radium 228
  • Selenium
  • Simazine
  • Styrene
  • TDS
  • 2,4,5-TP (Silvex)
  • Tetrachloroethylene
  • Tribromoacetic acid
  • Trichloroacetonitrile
  • Toluene
  • Toxaphene
  • 1,2,4-Trichlorobenzene
  • 1,1,1-Trichloroethane
  • 1,1,2-Trichloroethane
  • Trichloroethylene
  • 1,1,1-Trichloro-2-propane
  • Trivalent Arsenic @50 ppb
  • Trivalent Chromium
  • TTHM (chloroform)
  • Turbidity
  • Virus
  • Xylenes
  • Emerging Contaminants:
  • Atenolol (Group 1/B)
  • Bisphenol A (Group 3/A)
  • Carbamazepine (Group 1/B)
  • DEET (Group 1/C)
  • Estrone (Group 3/A)
  • Ibuprofen (Group 3/A)
  • Linuron (Group 1/B)
  • Meprobamate (Group 1/B)
  • Metolachlor (Group 1/C)
  • Naproxen (Group 3/A)
  • Nonylphenol (Group 3/A)
  • Phenytoin (Dilantin) (Group 3/B)
  • TCEP (Group 2/C)
  • TCPP (Group 2/C)
  • Trimethoprim (Group 1/B)