MLK Day Savings - Up to 55% OFF Select Filters!

Drinking Water Filter
OptimH2O® Reverse Osmosis + Claryum®

The OptimH2O Reverse Osmosis + Claryum combines premium filtration technology and reverse osmosis for optimum healthy and hydration. The only proven water filtration method to effectively remove fluoride plus 87 additional contaminants.

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

Select a faucet finish: Chrome
  • all-metal brushed nickel faucet
  • all-metal chrome faucet
  • oil rubbed bronze faucet
OptimH2O® Reverse Osmosis - Chrome is rated 4.2 out of 5 by 307.
  • y_2021, m_1, d_17, h_21
  • bvseo_bulk, prod_bvrr, vn_bulk_3.0.12
  • cp_1, bvpage1
  • co_hasreviews, tv_12, tr_295
  • loc_en_US, sid_308, prod, sort_[SortEntry(order=RATING, direction=DESCENDING), SortEntry(order=SUBMISSION_TIME, direction=DESCENDING)]
  • clientName_aquasanaserviceteam
  • bvseo_sdk, p_sdk, 3.2.0
  • CLOUD, getAggregateRating, 59.35ms
$19999 REVERSE OSMOSIS SYSTEMS - ends today!
  • MSRP: 439.99
  • Sale: 199.99

Save 55% + free shipping with Water for Life $199.99

Questions? We can help

  • 866-662-6885
  • SAT: 9AM–5PM CST

Whole Health

Ultimate Purity*

Aquasana OptimH2O Reverse Osmosis + Claryum delivers the best drinking water available for optimal hydration.

This 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 Reverse Osmosis + Claryum 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 87 additional 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 Reverse Osmosis + Claryum 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 Great product Installation was difficult for my small apartment, but instructions was straight forward. Works as intended.
Date published: 2021-01-11
Rated 5 out of 5 by from I am loving me some Aquasana Reverse Osmosis. It was put in by my brother in law and I with the help of a neighbor on the finished product. The product instructions were clear and understandable. Once we got it all out and placed in proper order things went well. The water taste was approved by my wife and that was all that was needed to be done. Our water is with the city and it is rated poor, but now the water taste clean and vibrant. Thank you so much for this wonderful product. I am signed up on the filter for life program so I can always enjoy this wonderful life giving device
Date published: 2020-12-30
Rated 5 out of 5 by from Best water investment ever I love my new aquasana under counter water system. I was buying bottled water and I know that’s not good for you. My water now tastes better than FIJI water. I call it my fresh squeezed water. Great investment
Date published: 2020-12-19
Rated 5 out of 5 by from Removes arsenic from our well water When we moved out to a rural property, we had to dig a new well. The water was really good except it tested positive for arsenic at 0.014 mg/L. EPA limit for public systems is 0.010 mg/L. So we installed the OptimH2O Reverse Osmosis system. Had it tested again last month and the arsenic level was <0.001 mg/L. One caveat, the Aquasana owner's manual states: "There are two forms of arsenic: pentavalent arsenic (As(V)) and trivalent arsenic (As(III)). In well water, arsenic may be pentavlent, trivalent, or a combination of both....Reverse Osmosis (RO) water treatment systems do not remove trivalent arsenic from water very well. RI systems are very effective at removing pentavalent arsenic." So if you have an arsenic problem, make sure you get your water tested for arsenic speciation (our county health department did it) and talk with Aquasana about your results. A couple of things about installation: 1) If you have a well like me, you need to make sure the pressure switch is set high enough (at least 40 psi) for water to make it thru all the filters. 2) I installed it on the basement wall instead of under the kitchen sink. That required making some custom brackets to attach to the foundation wall, and buying some longer connecting tubing at the hardware store. I enjoy this kind of thing, but its not for everybody. The big advantage for me is its very easy to change the filters. I can stand and work shoulder level instead of crouching down and working under the sink. Also, you're bound to spill some water or get leaks when changing filters, which necessitates cleanup under the sink. But in my basement it simply runs down to the floor drain and I walk away. Only negatives I can see are: 1) water flow is significantly slower than a regular faucet, but we quickly got used to it. If you don't like to wait each time, you can fill a pitcher and keep it in the fridge. 2) audible gurgles at the faucet when system is recharging, not a big deal for us but may annoy some 3) leaks after changing filters...took me a couple of tries and some food-grade lubricant on the gaskets to get rid of the oozing. Overall I am very pleased. Thanks Aquasana for making my water safe.
Date published: 2020-12-08
Rated 5 out of 5 by from Great value for good tasting water! After reading other positive reviews on the brand, we decided to purchase the under the counter reverse osmosis system. The purchasing process was easy and I even received a call from the company to confirm that I had actually chose the correct system for my home. I realize it was partly an extended sales call but I was still impressed that they made the effort to make sure what I had chose was correct for my application and for where I lived. The shipping process didn't take long and installation/setup was fairly easy to follow. All in all, we are very happy with purchase and it's very nice to not have to worry about all the extra contaminants in the water.
Date published: 2020-12-01
Rated 5 out of 5 by from It provides great tasting water I like the product; however, I would recommend that customers bite the bullet and have it installed professionally. It is trickier than the Aquasana videos suggest and boring a 1" hole in my quartz countertop was not fun. As for the purification system, it works beautifully.
Date published: 2020-11-30
Rated 5 out of 5 by from Great quality and fantastic customer service I purchased this system to replace a Whirlpool unit I had purchased from Lowe's. After placing my order I was contacted by a representative, who asked me some questions to make sure I was purchasing a filter that was right for my situation. The unit had great directions with detailed pictures. I easily installed it. It has a much better looking and sturdier faucet than my previous unit. I am completely satisfied, as I was also able to get the replacement filters sent yearly rather than every six months.
Date published: 2020-11-24
Rated 5 out of 5 by from Great filtering system We had one at our other house so once we moved we bought the RO system gor this house.
Date published: 2020-11-05
  • y_2021, m_1, d_17, h_21
  • bvseo_bulk, prod_bvrr, vn_bulk_3.0.12
  • cp_1, bvpage1
  • co_hasreviews, tv_12, tr_295
  • loc_en_US, sid_308, prod, sort_[SortEntry(order=RATING, direction=DESCENDING), SortEntry(order=SUBMISSION_TIME, direction=DESCENDING)]
  • clientName_aquasanaserviceteam
  • bvseo_sdk, p_sdk, 3.2.0
  • CLOUD, getReviews, 6.19ms

Learn More

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 70 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 Clean Water Machine 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

My stage 1 filter housing leaks for the RO3 undersink unit I have. How can I get a new one?

Asked by: JoeM
Hello JoeM, Thank you for reaching out to us! We are sorry to hear you are having issues with your system. Please contact us at 866-662-6885 and we will be happy to discuss your warranty options. We look forward to hearing from you. Thank you, Aquasana Customer Support
Answered by: Aquasana S
Date published: 2021-01-07

So its been about 2 months only use for coffee pot 12cup and it barely fills it up this am it basically stopped at 6 cups and just dribble usually it only does that after getting 12 cups

Asked by: mountainfox
I have city water and I've never had a problem with pressure or filling anything. I don't fill a 12 cup pot but I don't think I would have a problem doing that.
Answered by: Alton, NH
Date published: 2020-12-18

Does this filter work with electricity? How much voltage?

Asked by: kuzama
Good Morning, Thank you for reaching out to us! The system does not require electricity. If you have any further questions or concerns you may have. Kindly email us directly at or contact us directly at 866-662-6885, Monday thru Friday from 8 am-5 pm CST. Thank you, Aquasana Customer Support
Answered by: Aquasana S
Date published: 2020-12-14

?How much does the product weigh

Asked by: kuzama
There would actually be 2 different weights. Dry shipping weight around 15 pounds or less. Installed wet weight the filter assembly is about 10 pounds and the tank will be about 25 pounds.&nbsp;
Answered by: PurpVert96
Date published: 2020-12-15

Can I mount the RO system and tank in the basement below kitchen sink and approx. 15 ft. away without having to install a pump ?

Asked by: Dave c
My experience with an RO system says &quot;yes&quot;, but your circumstances may be different. I ran a hose to the refrigerator water dispenser. The hose drops from the sink into the basement, crosses over and comes up behind the fridge. That amounts to about 18ft. of 1/2&quot; poly tubing. It works great.
Answered by: P. T.
Date published: 2020-12-05

can the system be installed in the basement directly below the kitchen sink an run the water lines up to the sink

Asked by: kenzo
i think you would have to buy different water lines. It is a small system made for under the sink. I wouldn't recommend this for under the sink though. It refills the reservoir often and is noisy. we had several water leaks from the faucet it comes with. my husband installed it, but he is an aircraft mechanic and did it correctly. it is a poor design. we should have gotten the entire house RO system to be installed in the basement.
Answered by: CCAL
Date published: 2020-12-03

What size hole do i need to drill into my countertop?

Asked by: homer
Hello Homer, Thank you for your question. You will need a sink top hole 1&quot; in diameter. If drilling a new hole, ensure the faucet body will mount flat against the surface and that there is sufficient tubing between the faucet body and system manifold. NOTE: Drilling holes into solid surfaces or surfaces made of stone should only be performed by a qualified and certified installer. If you have any questions or concerns, you may also contact us directly at 866-662-6885, Monday thru Friday from 8 am-6 pm CST, and weekends from 9 am-5 pm CST. -Aquasana
Answered by: -ACS
Date published: 2020-11-30

Is storage tank plastic or metal?

Asked by: DROY
Hello, We appreciate your interest in Aquasana. Our Reverse Osmosis holding tank is made of stainless steel. If you have any follow-up questions, you may contact us directly at 866-662-6885, Monday thru Friday from 8 am-6 pm CST, and weekends from 9 am-5 pm CST. -ACS
Answered by: -ACS
Date published: 2020-11-27
  • y_2021, m_1, d_17, h_21CST
  • bvseo_bulk, prod_bvqa, vn_bulk_3.0.12
  • cp_1, bvpage1
  • co_hasquestionsanswers, tq_415
  • loc_en_US, sid_308, prod, sort_[SortEntry(order=LAST_APPROVED_ANSWER_SUBMISSION_TIME, direction=DESCENDING)]
  • clientName_aquasanaserviceteam
  • bvseo_sdk, p_sdk, 3.2.0
  • CLOUD, getContent, 50.14ms

To give you the best possible experience, our website uses cookies. You can review our privacy policy to find out more about the cookies we use and how to adjust your browser settings to block cookies. If you close this box or continue browsing our website, you accept our use of cookies.