Filter Replacement
AQ-RO3-R OptimH2O Reverse Osmosis
Stage 1 & 3

Carbon (Stage 1) and Claryum (Stage 3) filter cartridge replacements for the AQ-RO-3 OptimH2O Reverse Osmosis Drinking Water System.

Reverse Osmosis water filter

This filter set replaces stages 1 & 3 in the OptimH2O Reverse Osmosis water filtration system

  • MSRP: 64.99

Save 15% + free shipping with Water for Life $55.24

Questions? We can help

  • 866-662-6885
  • MON–FRI: 8AM–6PM CDT
  • SAT: 9AM–5PM CDT

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Set of replacement Carbon & Claryum filter cartridges for the AQ-RO-3 OptimH2O Reverse Osmosis Drinking Water System.

Carbon & Claryum filters (stage 1 & 3) should be replaced every 6 months or 365 gallons for optimal filter effectiveness.

Part numbers - AQ-RO3-CARBON, AQ-RO3-CLARYUM, AQ-RO3-R (set of Carbon & Claryum cartridges)

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Read the Reviews

OptimH2O Reverse Osmosis Stage 1 & 3 Filter Replacements is rated 4.9 out of 5 by 81.
Rated 5 out of 5 by from Easy to replace and no tools required I have been using Aquasana Products for years but only purchased the Reverse Osmosis Under Counter Filter when I moved to a house I am renting last July. This was the first time changing the filters and it could not have been easier. The directions were easy to follow and there are no tools required. I highly recommend this particular filter and Aquasana products in general. They have AMAZING customer service which I have called on a few occasions. I hope to build a new home in a next year or so and I will definitely add an Aquasana whole house filtration system.
Date published: 2017-03-07
Rated 5 out of 5 by from Easy to change, great taste These filters are replacements for my reverse osmosis system. I live in Los Angeles Echo Park area where we have fluoride, arsenic, radiation, and lots of gross sediment in the tap water. It's disgusting. When I first moved here I couldn't drink the water, even with a good filter, because it tasted so bad. The RO system is great and everyone loves our water, some friends even bring bottles and tak
Date published: 2016-07-06
Rated 5 out of 5 by from Amazing Water Filter System This system is the best we have ever owned. I researched water filtration systems for a year before choosing Aquasana. We wanted a filtering system that took fluoride out of the water and those are very difficult to find. Not only does this filter take fluoride out of our water, the water tastes wonderful, we take it on trips and to work because it is difficult to drink from other sources. We abso
Date published: 2016-07-22
Rated 5 out of 5 by from Very ease to change the filters The RO system is under my kitchen sink and I use it all the time for drinking and cooking. It is better than the last RO system I had because I can change the filters myself rather than having to call the Culligan man to change them for me. Also this RO system has a post filter that remineralizes the water so I no longer have to have a crock sitting on the counter and buy and add mineral drops t
Date published: 2015-12-11
Rated 3 out of 5 by from Good filters, not the b easiest to replace These filters work well but need to be replaced every 6 months and are not the easiest to replace. Custimer service is very helpful and was quick to send out a replacement for a filter that arrived broken. However it takes 24 hrs to replace a filter due to the need to run the water through for 24 hrs.., plus the several hours it takes to get the new filters in
Date published: 2017-05-23
Rated 5 out of 5 by from Great filter A very good filtering solution as long as you don't need constant flow. The bladder tank provides a pretty decent flow for up to about a gallon of water. After that the flow tapers off severely and you need to wait for the filtering system to fill the tank back to top pressure for good flow again. I find it adequate to our needs.
Date published: 2017-04-17
Rated 5 out of 5 by from What about annual remineralization? Hi. We installed the filters and noticed different, softer water taste so we wanted more crunch and add calcium to pitchers. We'll get the right proportion eventually. What about annual mineralization refills? They should come with every second delivery. What about trace minerals and a nitrate-nitritre test with annual delivery?
Date published: 2017-06-11
Rated 4 out of 5 by from Good value for the money Had difficulty getting a referral for installer, had to find someone on my own. The filter works fine and is a very good value for the money. I do find the faucet has a very slow pour so it takes a while to fill a pitcher of water. The water does taste much better though. I would recommend the product.
Date published: 2016-09-07
Rated 5 out of 5 by from excellent filtering I have an auto immune situation and I actually tested out allergic to my town's water through skin allergy testing. Then I was tested on my skin with the aquasana water and it was fine. no allergy! I recommended this system to another neighbor who also has auto immune disorder. I like this system.
Date published: 2017-01-10
Rated 5 out of 5 by from Best product for the money The water is not the best quality in areas here in Florida. This system Reverse Osmosis one has given me the quality of water I need and want. Water is life, and CLEAN WATER is a healthy life. This product and the filters are just great and reliable for what I need and want. Worth every penny.
Date published: 2017-04-11
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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