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 43.
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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 CDT

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

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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 Aquasana was an easy choice for our Family Aquasana was an easy choice for us. My wife did a complete research and found that Aguasana reverse osmosis AND remineralization was the only system on the market with a third-part NSF certification on not only one but 3 levels. We called Aquasana and they were easy to do business with. Although there was no installation video, the system was easy to install. I am NOT tech savvy, but I was able to
Date published: 2015-07-12
Rated 5 out of 5 by from Couldn't be happier with our OptimH2O This system was the only water filter I could find that removes more contaminants and remineralizes the water, leaving you with high quality great tasting water. No more running back and forth to the store for bottled water. Its low cost is saving me a ton of money. It was easy to install, we were able to easily connect it to our ice maker and water dispenser through our refrigerator. Very happy w
Date published: 2015-10-05
Rated 4 out of 5 by from Installer was impressed with the quality Delivery was fast, well-packaged and complete. We used a professional plumber who is familiar with water filter installations to install the under-the-counter unit at our kitchen sink.|He was impressed with the quality of the system and asked how we had purchased it.|After allowing the water to flow 24 hours to completely flush out the system, the water tastes like you imagine mountain spring wat
Date published: 2015-09-26
Rated 4 out of 5 by from 99% of all you need to know to install The installation was time consuming, but the instructions were clear and not too hard to follow - until it came to purging the unit after putting bleach in the holding tank. It needed to say that after bleach is put in the holding tank and then the tank has filled (takes about 3 hours after installed and the water is turned on) that when you open the filtered water faucet (that came with the unit)
Date published: 2015-05-13
Rated 5 out of 5 by from Very satisfied with all aspects of this product After reading previous reviews on this product I was convinced that the water tasted good and was of excellent quality. That is absolutely true. I now love to drink just pure water from the special tap.|My husband has some plumbing skills but he isn't a professional. He installed it in our very tight under the sink area in about 3 hrs with no issues. |Some people stated the water flow was too weak
Date published: 2016-01-19
Rated 5 out of 5 by from Great Tasting Water I use RO water for cooking and drinking only. I modified the placement of the system to the basement where my other water filters are installed. Set up took longer because of my placement plan, but no problems were found. Be careful to insert the push-on connectors firmly. Wait for pressure to build in storage tank to determine if leaks exist.
Date published: 2015-12-07
Rated 4 out of 5 by from Great tasting water! I am pleased with this product and with the taste of the water from this filter. I'm even pleased with how quickly it arrived. Customer service was excellent, too.|The only drawback is that the unit is challenging to install and the website offers no clear instructions or videos to help home owners get the job done.
Date published: 2015-07-09
Rated 4 out of 5 by from Nice - but ... Found this product harder to install than might be expected. Main problem was the fact that the instruction do not mention that the tubing needs to be pushed in one inch. This shortcoming lead to two leaks and calls to Aquasana.|Also, the production rate and through pressure are not exactly anything to rave about.
Date published: 2015-02-13
Rated 3 out of 5 by from Decent RO system This is my first RO system. The installation was horrible! They didn't send us one of the required parts the first time and the right parts the second time. I had to pay for the three visits of the plumber. Thankfully they agreed to pay for the plumber's cost for his 2nd and 3rd visit (yes, he is a very experienced and professional plumber, so he knows what he is doing). The customer care doesn't
Date published: 2016-02-16
Rated 5 out of 5 by from Exactly what it claimed to be The online instructions were great - precise and well detailed - so I could prep the sink before the unit arrived. It came onetime and in good condition. The challenge is getting a hole in my quartz counter top.|A cabinet guy from Berryville Ar, John Long, came over and drilled it for me and didn't even charge me. I had to spend just under $10 for additional under-sink plumbing. |There were se
Date published: 2015-06-22
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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).

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User Q & A

Does it remove salt from water softners

Asked by: Benny
Hi Benny, Thank you for your interest in Aquasana! The RO system will certainly remove any sodium added to your water by a softening system, so your water will be safe and healthy to drink! Thank you, Aquasana Customer Support
Answered by: Aquasana Customer Support
Date published: 2017-08-04

Do i need to let it run for 24 hours to purge?Just to confirm that means leave the faucet open so water is flowingg?

Asked by: Ralph
Hi Ralph, Once you get the system all set up, you just leave that faucet open for 24 hours to purge the tank of that bleach and saturate the membrane filter. After that 24 hour purge, you should be good to go, and you can start enjoying your Aquasana filtered water! Thank you, Aquasana Customer Support
Answered by: Aquasana Customer Support
Date published: 2017-08-15

How much water does it take per gallon of water?  Thank you!

Asked by: Kalina
Hello! Our Reverse Osmosis system will only produce 3 gallons of waste water for every 1 gallon of drinking water. Thank you, Aquasana Customer Support
Answered by: Aquasana Customer Support
Date published: 2017-07-27

I want to install it in the basement directly under kitchen base with sink and bring filtered water to the faucet above (there is no room in the base) will I have enough of pressure up there?

Asked by: Wlodek

What exactly does the REMINERALIZATION add back to an 8oz amount of water? Is there a spec sheet for the REMINERALIZATION unit?

Asked by: Entity

Does this unit auto shut off once tank is full or does the waste line from the RO keep running?

Asked by: DMIN

Will this system remove arsenic from the well water.

Asked by: rstand

Do you have instructions on how to add this to the refrigerator water line ?

Asked by: Larry
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