Drinking Water Filter
OptimH2O™ Reverse Osmosis + Claryum®

Reverse Osmosis plus Claryum® Filtration Technology for optimum health and hydration: the only proven water filtration method to effectively remove fluoride.

Tested & proven to remove 5X more contaminants than other RO systems

Select a faucet finish: Brushed Nickel
  • all-metal brushed nickel faucet
  • all-metal chrome faucet
  • oil rubbed bronze faucet
OptimH2O Reverse Osmosis - Brushed Nickel is rated 4.3 out of 5 by 220.
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  • MSRP: 399.99
  • Sale: 187.00

Save 53% + free shipping with Water for Life $187.00

Questions? We can help

  • 866-662-6885
  • SAT: 9AM–5PM CST

Whole Health

Ultimate Purity*

Aquasana OptimH2O delivers the best drinking water available for optimal hydration.

OptimH2O is the first reverse osmosis system of its kind to pair powerful reverse osmosis filtration with Claryum selective filtration PLUS remineralization.

Remove the most contaminants from your water while maintaining the benefits of healthy minerals other reverse osmosis systems simply remove.

OptimH2O removes:

  • 95% fluoride and mercury
  • 97% chlorine and chloramines
  • 99% lead, asbestos and arsenic
our reverse osmosis filters 5 times more contaminants

For a complete list of contaminants reduced please see our Performance Data Sheet.

Whole Health


Remove over 95% of fluoride without demineralizing your water for optimally healthy, clean water.

Reverse Osmosis is the only proven water filtration method on the market to effectively remove fluoride from regular tap water.

Whole Health

Drinking Water

Remineralizes water to put back the healthy minerals lost in the reverse osmosis process like calcium, magnesium, and potassium.

Improves water pH balance for optimally alkaline drinking water.

Pure Performance

Reverse Osmosis + Claryum® Technology + Remineralization

Filters out dissolved solids smaller than 1 micron like fluoride and arsenic.

Reduces organic chemicals like herbicides, pesticides, VOCs and MTBE.

Targets chlorine and chloramines (chlorine + ammonia disinfectant).

Filters heavy metals like lead and mercury.

Absolute Sub-Micron Filtration Captures asbestos and chlorine resistant cysts like giardia and cryptosporidium.

Remineralization Puts back healthy minerals to improve pH balance & water alkalinity.

The result: Effectively removes >95% of fluoride plus over 80 other contaminants and puts back healthy minerals for optimal drinking water.

Pure Performance

Easiest filter Replacement

Replacements engineered for ease. Eco-friendly carbon and Claryum filter housings easily twist off so replacing your filters is a snap!

Pure Performance

Ultra Fast

Aquasana OptimH2O features a reliable flow rate to deliver optimally clean, healthy water fast!

0.5 GPM

How It Works

Superior Filtration

Reverse osmosis reduces 14 impurities including fluoride, nitrates, nitrites, lead, radium and arsenic.†

Selective Claryum® Filtration reduces 74 contaminants including chlorine, chloramines, heavy metals, pesticides, and herbicides.

Remineralization designed to provide healthy amounts of calcium, magnesium and potassium for optimally alkaline, pH balanced water.

certified by NSF

Tested and Certified to NSF/ANSI Standards 42, 53, 58, 401 + P473 in model AQ-RO-3 for the claims specified on the Performance Data Sheet

  • 1 year RO membrane life**
  • 1 year remineralizer life**
  • 6 month carbon/ Claryum filter life
  • 2 year warranty
  • 90 day guarantee

** Capacity depends on water quality and usage.

Help & Support

Video Help

  • How to install the under counter reverse osmosis system
  • How to replace the membrane cartridge and the remineralizer in the AQ-RO-3

Installing the RO under counter system

Replacing the membrane cartridge and the remineralizer in the AQ-RO-3

Learn More

Product Information

  • Daily Production (DPR): 13.32 gallons
  • Operating Pressure: 40-100 psi
  • Operating Temperature: 40-100 F
  • Manifold Dimensions: 12" × 4.5" × 12.5" (L × W × H)
  • Tank Dimensions: 16" × 11" (H × Diameter)

Learn More

Read the Reviews

Rated 5 out of 5 by from Flouride and Chloramine filtered out! My husband found it easy to install and easy to replace the filters. The water tastes great. So much better. The ease of use is amazing and economical too! I just love the peace of mind it gives me.
Date published: 2018-12-10
Rated 5 out of 5 by from great Good $ , great water ,easy install , nice looking faucet
Date published: 2018-12-09
Rated 5 out of 5 by from Best tasting water!!! We did not install ourselves, he renovated our kitchen and had our contractor install the water filter. We first bought one at Lowes, the pressure was really low and took a long time to fill a glass of water. We went on line and looked for a filter that had the best flow rate and came upon Aquasana. The reverse osmosis taste great, was taken back and called when about the instructions that the first day you have to run water for n24 hours!!! but it was a slow drip and not a lot of water was wasted as I thought would be.
Date published: 2018-11-12
Rated 5 out of 5 by from Works as described. I use this for coffee, drinking water and humidifiers. It was easy to install but it did not come with enough tubing. I had to buy more for the big box store.
Date published: 2018-10-12
Rated 5 out of 5 by from Reverse Osmosis system Water tastes great. Our plumber had no problem with the installation. It fits under one half of our counter which is better than expected. Installation video was a great idea.
Date published: 2018-09-24
Rated 5 out of 5 by from Solid Product I made sure to research different RO systems and Aquasana's did everything I needed it to, all while falling in my price range. Installation: I noticed a lot of people complained about not being informed about the system's setup only to end up with exuberant plumber charges. However, I was able to install my RO system in about an hour after drilling the hole in my sink for its faucet. The only leak I had was fixed once I reinstalled one of the filters. None of this was complicated because I made sure to READ all the product's information, setup instructions & watch the installation video they provided before even buying the product. I'm honestly amazed at how ignorant and lazy people are. Product: I've had my RO system for over 6 months and everything is running smoothly, water tastes great (you can definitely taste the difference in mineral content and quality compared to tap and/or filtered), and even though it does have a bit of a slow flow rate, it's really not that bad. Takes about 2 minutes to fill a half gallon pitcher that II place in the fridge so I always have cold water.
Date published: 2018-09-05
Rated 5 out of 5 by from reverse osmosis system water tastes fine. Had the unit professionally installed during kitchen remodel.
Date published: 2018-05-17
Rated 5 out of 5 by from Better water quality taste. Aquasana RO filter meets my water quality expectations compared to my old type RO filter sets been used for the last 15 yrs. The water is fresh and delicious. It is easy to install and replace the filters when needed.
Date published: 2018-05-09
Rated 5 out of 5 by from Great Great product, easy to install, certified to remove trace contaminates.
Date published: 2018-05-08
Rated 5 out of 5 by from Great Product with excellent instructions It is rare that I buy a product that needs to be installed or assembled that has instructions as good as what came with the OptimH2O RO. Installation took 2 hours, it took me 40 minutes to get the slotted washer on the faucet assembly, ( tough reach), I kept dropping it. The trick for me was to turn the faucet assembly 90 degrees to allow the washer to slide on more easily. The water is Great!
Date published: 2018-05-01
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Aquasana FAQs

  1. Do I need a plumber to install the system or can I install it myself?

    Depending on your existing skills and experience, we recommend hiring a professional to install your reverse osmosis system. Installation does require drilling into your pipes which is not recommended for individuals unfamiliar with plumbing and permanent appliance installation. Please read through the owner's manual carefully before attempting to install the system. If you have any questions or need assistance, our technical support representatives at 866-662-6885 can walk you through the installation process.

  2. How often do I have to replace the cartridges and membrane?

    • Stage 1 (Carbon) and Stage 3 (Claryum) filter cartridges should be replaced every 6 months or 365 gallons. To make replacements easier and cheaper, these cartridges are eligible for our Water for Life auto-ship program. Get free shipping, the best discounts, and an extended product warranty by joining Water for Life.
    • We recommend replacing Stage 2 (RO Membrane) every 2 years depending on usage and water quality. For homes with higher water usage and/or poorer water quality, you may need to replace your RO membrane every 1 to 2 years. For homes with lower water usage and/or better water quality, you may only need to replace your RO membrane every 2 to 3 years.
    • We recommend replacing the remineralizer every 1 year depending on usage and water quality.

  3. Is this purified water?

    Yes. The Aquasana OptimH2O uses reverse osmosis to effectively purify your drinking water. In addition to reverse osmosis, the OptimH2O system also uses selective filtration to reduce over 60 other contaminants, plus includes a remineralizer designed to put back healthy minerals like calcium, magnesium, and potassium that are removed in the reverse osmosis process.

  4. I'm a renter, so I can't drill or modify the plumbing. What should I do?

    Unfortunately, drilling into your water pipes is required to install the Aquasana OptimH2O Reverse Osmosis system. If you already have an existing hole for a vegetable sprayer or soap dispenser on your sink countertop, our AQ-5200 and AQ-5300 Under Counter Drinking Water Systems can be installed without making permanent changes to your sink and are great options for rental properties. If there is not an existing hole on your sink countertop, we also have two countertop options that offer the same professional grade filtration as our under counter options (please see the Powered Water Filtration System or AQ-4000).

  5. I have an existing filtration or side faucet from a previous system. Can I use that with my new Aquasana water filter?

    The faucet included with the Aquasana OptimH2O is specifically designed and NSF tested and certified to work with our reverse osmosis system — any other Aquasana faucet or faucet from another filtration system not designed to work with a reverse osmosis system will not work for the Aquasana OptimH2O and may cause damage to your filtration system. If you choose to use another reverse osmosis air gap faucet, we recommend you enlist the help of a plumber to ensure proper installation.

  6. Why is it important to flush my OptimH2O Reverse Osmosis System during the initial installation?

    When RO membranes are manufactured, there is a preservative used to protect the membrane fibers from damage. This preservative needs to be flushed out after the system is installed and prior to drinking water from the RO system. In addition, the RO holding tank should be sanitized with a drop of bleach during the install. It is important to flush the system for the entire 24 hours during the initial install to ensure all the bleach from the holding tank is washed away before consumption.

  7. What does TDS mean?

    TDS is the acronym for Total Dissolved Solids, the amount of dissolved minerals and metals present in water. TDS meters tell you the concentration of dissolved minerals and metals, but are not an accurate measurement for contamination. Aquasana products reduce and remove harmful TDS like lead, but selectively retain or replace healthy dissolved solids like calcium, magnesium, and potassium. Aquasana OptimH2O comes standard with a 1 year remineralizer designed to replace healthy calcium, magnesium, and potassium lost in the reverse osmosis process.

  8. Does the Aquasana OptimH2O remove fluoride?

    Yes. The Aquasana OptimH2O is NSF Certified to remove over 95% of fluoride from your drinking water.

  9. Does the Aquasana OptimH2O remove arsenic?

    Yes. The Aquasana OptimH2O is NSF Certified to remove over 97% of arsenic from your drinking water.

  10. How many gallons does the RO holding tank store?

    The RO holding tank stores 3.2 gallons of water at a time.

  11. What is the flow rate of the Aquasana OptimH2O?

    OptimH2O flows at a rate of 0.5 gpm (gallons per minute).

Learn More

User Q & A

What replacement cartridge removes arsenic?

Asked by: dcarlson
The Stage 2, RO Membrane filter exclusive to the RO system. I believe this is one of the benefits of employing a reverse osmosis system. I have been using one for several years now and am confident of its ability to provide the best drinking water. The other systems to my knowledge do not remove arsenic.
Answered by: TimJames
Date published: 2018-12-07

does this unit have to have a water softener to provide water supply ?

Asked by: rubble41
I would not think so. I am very happy with the unit. I do have a water softener for other reasons. 
Answered by: Lindle Services
Date published: 2018-12-06

Can the re-mineralizer work with the under counter three stage filtration system?

Asked by: hlyrler
A re-mineralizer would be a nice addition to any filter system, especially one that removes the good with the bad, like a reverse osmosis. If by "works" do you mean "fits"? With my 3 stage RO filter the storage tank it by far the largest part...about the size of a 20lb propane tank. The in-line re-mineralizer is small. It all fits under the counter in your sink base.
Answered by: Bruce2020
Date published: 2018-11-30

How effective is this system at removing 1,4 dioxane?

Asked by: Jgc10
All of our drinking systems are NSF Certified to Standard 53. The NSF International, the Water Quality Association, Underwriters Laboratories and CSA International all certify home treatment products for removal of contaminants. The relevant dioxane removal standard is NSF/ANSI Standard 53. 
Answered by: Aquasana Service Team
Date published: 2018-11-21

Does the RO system filter Uranium out of the water? It doesn't list it in the contaminants unless it is under heavy metals?

Asked by: Sean M.
Point of use reverse osmosis (RO) and distillation treatment will remove uranium. Our system received certification prior to the issue of Uranium in well water came to the forefront, so it has not been certified for it. However, Reverse Osmosis strips your water of contaminants down to 0.0001 microns.
Answered by: Aquasana Service Team
Date published: 2018-11-16

Does the RO system remove the GEN EX  contaminants that are apparently present in the Wilmington, NC water? We are new to the area and can’t seem to get an accurate answer as to how safe it is to drink the water. 

Asked by: Loubrooke
Thank you for your inquiry. Granular Activated Carbon and Reverse Osmosis have been demonstrated to be effective at considerable reduction of the contaminant. Our Reverse Osmosis filters with Activated Carbon and Reverse Osmosis.
Answered by: Aquasana Service Team
Date published: 2018-11-16

Where are the component dimensions? How much vertical height is needed to remove and replace the cartridges, including their manifold? Need # of inches from top of manifold to bottom of a removed cartridge, and the tank dimensions.

Asked by: David W
David, We are glad to assist. The Reverse Osmosis Manifold Dimensions are: 12" × 4.5" × 12.5" (L × W × H) If further assistance is needed, please contact our support team at 866.662.6885. Thank you, Aquasana
Answered by: Aquasana Service Team
Date published: 2018-11-06

does it take out calcium

Asked by: woody woodpecker
Hello, Thank you for your question. The Reverse Osmosis remineralizes water to put back the healthy minerals lost in the reverse osmosis process like calcium, magnesium, and potassium. Thank you, Aquasana
Answered by: Aquasana Service Team
Date published: 2018-11-06
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