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 4.5 out of 5 by 132.
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$187 REVERSE OSMOSIS SYSTEMS - limited time!
  • MSRP: 399.99
  • Sale: 187.00

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

Questions? We can help

  • 866-662-6885

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

Installing the RO under counter system

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 Great tasting water We bought this RO system just before the Black Friday deals came out. Guess we should have waited but it is still a good deal. My husband values clean-tasting water even more than I do, and we are both very happy with the water quality.
Date published: 2017-12-06
Rated 5 out of 5 by from wonderful product I bought this r o product about a month ago for my church kitchen and what a blessing. We now have clean, clear and healthy water. We have noticed the difference in our water now, no after taste now. This is an extremely good product and inexpensive for its performance. I soon will get one for my home, or maybe a whole house well r o filtration product.
Date published: 2017-12-06
Rated 5 out of 5 by from Reverse osmosis Well, I still have to install it. But it should be great.
Date published: 2017-12-04
Rated 1 out of 5 by from Could not get it to work Purchase and receipt of the device went splendidly. However, the plumber could not get the device to work. He spent a lot of time talking to technical support and fiddling with it but to no avail. I returned the device; return and refund were as easy as the purchase and shipping ... if only the device were as good.
Date published: 2017-12-03
Rated 5 out of 5 by from Almost Perfect I have installed other RO Systems and this was one of the easiest. (The only exception would be a shut off valve for the system as part of the install because I do want to add on a line to the refrigerator at some point) The difference in my espresso making became apparent right away. The coffee tastes much better and the build-up of minerals has stopped. (I think my espresso machine is happier too).
Date published: 2017-11-28
Rated 5 out of 5 by from Great R/O unit! We are very happy with our R/O unit. My husband installed it with little difficulty. The water tastes great!
Date published: 2017-11-28
Rated 5 out of 5 by from Ron164 I installed 2 weeks ago. The installation was a breeze. Taste is excellent. No issues at all. I would highly recommend.
Date published: 2017-11-22
Rated 4 out of 5 by from I'm very happy with my water filter! The installation instructions and video were very good, and the installation of the unit was straightforward, and easy for many do-it-yourself-ers. I got a little hung up at one point in the process when I had to disconnect a tube that I had already connected--it was easy to do, once I found out online how to do it, but the instructions should have that little tidbit more prominent. (I never found out how to disconnect the tubes from the connectors in the instructions, but there are plenty of online resources to tell you how it's done.)
Date published: 2017-11-21
Rated 5 out of 5 by from Very happy with this product The water taste is great, very clean, and I am drinking more water because of it. I was very concerned about toxins in the tap water because of a warning our city water company issued. I now feel safe, and that is important! My dog thanks you too.
Date published: 2017-11-20
Rated 4 out of 5 by from Reverse osmosis filter We just installed the unit over the weekend and have not had a chance to use the system yet. We are still running the water through it as part of the installation. The installation was very easy and I was able to accomplish it without a problem. One negative comment is the "manifold" mount key holes. Since the filters require upward pressure to install, it is difficult to get enough force on the screws provided to prevent the manifold from sliding up on the screws. I recommend using flat washers under the screw heads to apply more friction and more evenly distribute the loads on the plastic mount.
Date published: 2017-11-20
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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

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: 2017-12-07

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

Can the OPTIMH2O REVERSE OSMOSIS + CLARYUM filter be used as a whole house filter?

Asked by: Guillermo
Thank you for your interest in Aquasana! This is an under counter drinking water system. It would not be suitable for use as a whole home system, as the flow rate and filtration capacity would not accommodate your entire home. Thank you, Aquasana Customer Support
Answered by: Aquasana Customer Support
Date published: 2017-11-28

How much is a Stage 2 (RO Membrane) filter that needs to be replaced every 2 years and where can you find it?

Asked by: neale
Hello! The RO membrane should be changed every 12 months. The product can be found on our website for $59.99 here - https://www.aquasana.com/replacement-drinking-water-filters/reverse-osmosis-membrane We also offer Water For Life for this filter by request over the phone, which will give you a 15% discount + free shipping. Please give us a call at 866.662.6885 if you have any questions! Thank you, Aquasana Customer Support
Answered by: Aquasana Customer Support
Date published: 2017-11-28

I have a granite countertop and cannot drill a hole, can this be installed to redirect to existing water faucet? I need something that filters for fluoride.

Asked by: GiGi5555
Jackie, I'm a General Contractor, as far as I know there is no way to connect this to your existing faucet. My suggestion is to call your local Counter Top Company and have a professional drill a hole for you. That's what I would do myself. Hope this helps..
Answered by: David242
Date published: 2017-11-28

Does the large dumb fill completely, mine is light but water comes out of the faucet 

Asked by: Kay’s
I never weighed the tank after operation, but I get plenty of water.  Remember water is only 8 lbs per gallon, so how heavy do you think it should be?  Enjoy your new water.
Answered by: TimJames
Date published: 2017-11-18

I got this filter a year ago. I just hooked it up two days ago. Do i need to get new filters or are they fine since they’ve never been used only sat for a year

Asked by: Anonymous
I would use them if they were not filled with water I wouldn’t worry about shelf life
Answered by: Stang
Date published: 2017-10-26

It seems this would work well with a whole house system. Would its filter life increase if used after the whole house filter. Seeing this get somethings out of the water the whole house does not. Also can you tee of the output to feed a fridge?

Asked by: Steve1234
Ours feeds the frig from under the kitchen sink. Not sure it has the capacity for whole house. Ours runs quite often with just 2 of us using water and ice mainly from the frig and a gallon or less from the faucet.
Answered by: Deb9
Date published: 2017-12-04
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