Fluoride Water Filter
OptimH2O™ Reverse Osmosis + Claryum®

Remove over 95% of fluoride without demineralizing your water for optimally healthy, clean water. The only proven water filtration method to effectively remove fluoride.

Tested & proven to remove >95% of fluoride + over 70 other contaminants

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 4.4 out of 5 by 143.
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  • MSRP: 399.99

Save 20% + free shipping with Water for Life $319.99

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 70 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 65 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)

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Read the Reviews

Rated 5 out of 5 by from Fantastic system My husband put it in one afternoon. He thinks the water tastes a lot better. I was waiting for something like this to come out so I am happy it deals with the Chloramines and fluoride.
Date published: 2018-01-12
Rated 3 out of 5 by from Not what I expected I was looking for a RO system that would work on the ice and water dispenser on my frig. The sales person I spoke with said it would work and all I need to get was an air gap. I installed the system, did the 24 hour purge and now I do have water to the frig but there is such a loss of pressure that it takes almost a minute to fill a small glass. Called tech services and they said that since I installed the system to a frig that they can't support it.
Date published: 2018-01-05
Rated 2 out of 5 by from Ummmm. . . To be determined? After 2 weeks I can only say Aquasana’s customer service seems adequate. I’m yet to experience a functioning system despite professional installation by a licensed plumber 2 weeks ago. Day after day I switch filters, purge, put air in tank with a bicycle pump (really?) all as instructed by what seems to be a knowledgeable customer service associate. Apparently there is a bad batch of red filter elements as well, a batch that interrupts water flow into the tank, but after 2 filter changes (all directed and supported by Aquasana customer service) my system still doesn’t work. Finally I insisted on a whole new red canister (or return authorization for the whole system) and this may have solved the problem. We are running it now, hoping for the best. Amidst all this I got a generic solicitation from Aquasana to give them a review. Here it is!
Date published: 2017-12-29
Rated 4 out of 5 by from Upgrade water system Lost a star because of UPS shipping. Link was useless and both deliveries were slow. Like the water system, flow rate is strong, great aquarium water, great tasting. Takes a fair amount of space under the sink and I broke one of the plastic fittings. Customer service was awesome sending a free replacement part but UPS took a week.
Date published: 2017-12-25
Rated 5 out of 5 by from Great system! I love my new water filter system. It was very easy to install and it was reasonably priced. Great quality and easy instructions. Thanks much!
Date published: 2017-12-21
Rated 5 out of 5 by from No more bottled water! Best purchase of the year! What can be more important than the basics of life such as clean water! Love that this RO puts the minerals back in (not like those other RO systems on amazon which I ordered and returned!) Installation is key (judging from some of the reviews...) and my plumber aguaventuresllc@gmail.com is the best installer in NJ. House system going in next!
Date published: 2017-12-20
Rated 1 out of 5 by from Oh dear!!!! Why, why WHY didnt you mention on the FIRST PAGE of your installation instructions that this RO unit requires a special adaptor if one has a single sink?????? This is so unfair to your customers. We paid a plumber’s visit only to learn that we must order an $8.95 adaptor for single sink applications OR pay our plumber an $250 above the $350 install fee to make us a fitting which will accept this unit in order to insure the disposal doesn’t back up into it and contaminate it. NOT FAIR~
Date published: 2017-12-19
Rated 5 out of 5 by from Love this Month in, and great water...hubby put it in easily. Thankful to be free from bottle water!
Date published: 2017-12-18
Rated 5 out of 5 by from Installation November 2017 we ordered the unit. We have enjoyed the unit, and the taste of the water. The unit is supplying water to a faucet in the kitchen and to the refrigerator's ice maker. The filters are installed upstairs under the kitchen sink and the tank is in the basement utility room. The waste water tube is setup to drain into the basement utility room drain that the wash machine uses. This setup required extra equipment that we were able to get from the local hardware/plumbing department store. If I would do it over I would have had all the equipment plumbed in the basement utility room. The reason for putting the unit the basement would be to save space under the kitchen sink. Also, we have been an Aquasana customer for years. We used the under the sink filter system until now. The reason for the change we didn't want to consume the fluoride the city added to the water. This unit is designed to remove that element.
Date published: 2017-12-18
Rated 5 out of 5 by from Easy install and great tasting water I am very pleased with my purchase. The system was a breeze to install. The instructional diagrams and the color coded hoses made it easy. The only issue I had was that filter system was slightly too tall to accommodate a deeper sink. I was able to install it, but had to leave the cover off.
Date published: 2017-12-18
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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

Do you have a system that doesn't require an extra faucet on the countertop ? I have a granite top and an under mount sink. If the cold line out of the wall can be connected between the flexible line and feed then I can have even the ice maker hooked up.

Asked by: Northeast
This system doesn’t require the extra faucet. However, you would need additional plumbing connectors that are not included. I would recommend using a licensed plumber.  Ron164 
Answered by: Ron164
Date published: 2018-01-12

hello Is it normal that after that we are pouring a couple of glass of water the system start with a noise like the water is coming through the pipe to the filter .We need to turn off the water valve and turn back on and it stop Thank you

Asked by: MAB1
I would love to have our support team help you out. If you could email your question plus your contact information to: support@aquasana.com, someone can reach out to you directly to help you!
Answered by: Aquasana Customer Support
Date published: 2018-01-11

I am looking for counter top REVERSE OSMOSIS

Asked by: Elisa
Hi Elisa - Our reverse osmosis system is an under-counter unit as it has to connect to the water line that's underneath your sink. We do not have a reverse osmosis system that could be installed above your counter. Our other drinking systems are NSF certified to remove 77 contaminants. If your main concern is not fluoride, you may want to take a look at our Clean Water Machine or our Countertop Water filter: https://www.aquasana.com/drinking-water-filter-systems/countertop-attached
Answered by: Aquasana Customer Support
Date published: 2018-01-11

Has anyone used this in an RV?

Asked by: Ys144
I haven't personally, however, this RO is designed to work with any fixture source, regardless of where the inlet is located.  Also, you may want to measure for appropriate installation space.  I would not try to hide the unit and install it top side except for the holding tank.  Put the tank under the sink and the filters up where they are easily accessible for service/change.
Answered by: TimJames
Date published: 2018-01-06

What is the aquasana optimh2o reverse osmosis system made of? Is it plastic?

Asked by: Nichole
Faucet and water tank are metal. Filters are plastic.
Answered by: Jpzc
Date published: 2017-12-30

Where do the minerals come from that you are putting back into the water?  Is it possible to get this system without the minerals adding back?

Asked by: Pickyhusband
I am a new user of the Aquasana OptimH20 Reverse Osmosis system. The minerals come from the remineral cartridge that came with the unit. I found that the healthy minerals improves the taste of the water so much that I am drinking 2 to 3 times more water than before. Coffee & iced tea are great tasting. My wife cooks with the minerlized water. It is possible to not install the cartridge by connecting the faucet tube directly from the faucet into the manifold. Hope this helps with your decision. Ron164
Answered by: Ron164
Date published: 2017-12-17

Hello..is there a filter to change..and how often..and is it more than one filter to change or just one ?

Asked by: Yolandaf
It all depends on your usage, city, rural or well water. If you have a lot of minerals or a lot of chlorine I recommend every 6 months. Usually because it is only used for drinking water, I would change all of them once a year. You can also flush it through with a little chlorine after 3 or 6 monthsif you dont want to change filters. Good product for sure.
Answered by: colonelj
Date published: 2017-12-23

Does this systems price include the first three filters or do I have to purchase them seperatly?

Asked by: Lori
Yes the price include it
Answered by: Ahmad
Date published: 2017-12-06
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