Under Counter Water Filter
3-stage Max Flow

The best performing water filter now with 44% faster water flow, 800 gallons of filter life capacity and Bluetooth® connectivity for filter tracking.

Select a faucet finish: Brushed Nickel
  • all-metal brushed nickel faucet
  • all-metal chrome faucet
  • oil rubbed bronze faucet
3-Stage Under Counter Water Filter Max Flow - Brushed Nickel is rated 4.4 out of 5 by 112.
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  • MSRP: 349.98
  • Sale: 174.99

Save 50% + free shipping with Water for Life $174.99

Questions? We can help

  • 866-662-6885
  • SAT: 9AM–5PM CDT

Whole Health

Ultimate Purity*

Instantly transform ordinary tap water into clean, extraordinary water.

NSF Certified Claryum® filtration technology independently tested and proven to remove over 97% of chlorine and chloramines. Also reduces:

  • Heavy metals like lead and mercury
  • Chlorine resistant cysts like giardia and cryptosporidium
  • Organic chemicals like herbicides, pesticides and VOCs
  • Pharmaceuticals like estrone and ibuprofen

For a complete list of contaminants reduced please see our Performance Data Sheet.

Aquasana filters 10 times more contaminants

Whole Health

Ultra Delicious

Claryum®'s selective filtration technology retains naturally occurring beneficial minerals in your water like Calcium, Potassium and Magnesium for healthier, more delicious water!

Whole Health

Eco Friendly

Designed with the environment in mind! Intelligent system design reduces plastic waste by minimizing disposable plastic parts.

Pure Performance

Claryum® Technology

Activated Carbon Reduces pharmaceuticals, herbicides, pesticides, VOCs and MTBE.

Catalytic Carbon Targets chlorine and chloramines.

Ion-Exchange Filters heavy metals like lead and mercury.

Absolute Sub-Micron Mechanical Filtration Captures asbestos and chlorine resistant cysts like cryptosporidium and giardia.

The result: 10x more contaminants reduced than the leading pitcher plus healthy minerals retained for purely delicious filtered water.

Pure Performance

Easiest filter Replacement

Replacements engineered for ease. No need to disconnect hoses or water lines. Eco-friendly filter housing easily twists off so replacing your filters is a snap!

Pure Performance

Convenience & Value

Fewer filter replacements. More clean, great-tasting water.

One set of Aquasana Claryum® filters gives you 20x the capacity of the leading gravity-based pitcher at only 8¢ per gallon with Water for Life.

Pure Performance

Increase Performance

Extend the life of your system. Improve effectiveness.

Three Stage System features a 20 micron pre-filter to capture rust, sediment and silt that can clog your system. Extends filter life capacity to 800 gallons!

Pure Performance

A Smarter System

The Aquasana AQ-5300+ alerts you when it's time to change your filters. No more guessing if and when you need to replace your old filters.

Pure Performance

Designer Faucet

Match your kitchen décor with a designer faucet featuring all metal construction.

Pure Performance

Now connected with Bluetooth®

  • Track Gallons Filtered
  • Measure Environmental Impact
  • Estimate Dollars Saved by not buying bottled water
  • Alerts You When your filter is low
  • Order Replacement FIlters
  • Apple App Store for iOS
  • Bluetooth device

How It Works

Superior Filtration

Selective Claryum® Filtration

Reduces 77 contaminants while retaining beneficial minerals for optimal hydration.

Easy to install, replace & maintain

Filter lasts up to 6 months and features easy twist-off design.

certified by NSF

NSF Certified

Full system tested and certified to NSF/ANSI Standards 42, 53, 401 + P473 for the claims specified on the Performance Data Sheet.

  • 800 gallons
  • 6 month filter life
  • 1 year warranty
  • 90 day guarantee

Help & Support

Video Help

  • How to install the 3-stage Max Flow water filter
  • How to replace the AQ-5300+-R under counter filters

Installing the Max Flow under counter system

Replacing the 3 filters in the AQ-5300+

Learn More

Read the Reviews

Rated 5 out of 5 by from Great product great company We purchased this a few weeks ago and have been satisfied with its service. Installation was fairly easy although I think instructions could be a Bit better and hoses a little bit longer. The company was great to deal with when I had an issue with color of a faucet.
Date published: 2018-04-22
Rated 5 out of 5 by from Easy installation with great tasting water Under counter installation was straightforward. The resulting water taste from the Aquasana exceeds that of the name-brand bottled water I was consuming.
Date published: 2018-04-18
Rated 5 out of 5 by from Easy Install I am impressed with the quality of the product and made in America. Was easy to install and love the taste of the water, flows fast as advertised, thank you Aqusana
Date published: 2018-04-17
Rated 5 out of 5 by from Finally, clean, fresh tasting water! I recently ordered our under counter water filter directly from Aquasana, and we finally have clean and fresh tasting water available anytime! The installation was fairly simple if you have some basic plumbing knowledge. I also hooked up the icemaker line to the water filter, which required one additional T-connection, but really no big deal. Some people complain about the slow flow from the faucet. Yes, the filtered water does not run like the normal kitchen faucet, but waiting 30 seconds for the kettle to fill to make a great tasting pot of tea is definitely worth it. For the sake of our own and our families health, can't we wait 5 seconds for a glass of water to fill? The one negative for us was the fact that the filter system only comes with three choices for the faucet: brushed nickel, chrome or oil rubbed bronze. Since we have a white sink and kitchen faucet we needed a white faucet for the water filter as well. We ordered it separately (not available from Aquasana) online for about $35, and now we have our filter system perfectly the way we wanted it. No more buying drinking water! Ever!
Date published: 2018-04-14
Rated 5 out of 5 by from Works Great! Great filter and not to bad to install, i would buy this again
Date published: 2018-04-12
Rated 5 out of 5 by from Positively THE BEST !!!! We have used other filters, however we have found AQUASANA to be the very best and easiest to use! The taste is so clean, clear, and refreshing - surely it is the purest water to enter one's body. Water is life, Life is water, and AQUASANA is the finest water to quantify your life.
Date published: 2018-04-10
Rated 5 out of 5 by from Great taste I bought this a few weeks ago and am very satisfied with the taste and quality of the water I’m getting. Thanks Aquasana!
Date published: 2018-04-10
Rated 5 out of 5 by from Unit met all expectations ! Product is well made ! Installation was easy ! Aquasana put LOTS of thought into both the unit and its documentation. Manual and all installation instructions are well written in GOOD English ! Supporting Videos are well done !
Date published: 2018-04-10
Rated 5 out of 5 by from Great filters-faucet not so great I upgraded to these new larger filters from the smaller Aquasana 3-stage filters to get better flow, more volume, longer filtering capacity. Noticed immediately more volume to fill the kettle to make coffee and fill pots for soups, etc. Was worth the upgrade. Did not use the faucet that came with the the filter kit as it is too short/not enough reach. Instead installed a QMP Ceramic Disk Drinking Water Faucet- Brushed Nickel-QMP804-BN. This faucet sits a good bit higher and is deeper/has more reach to fill pots and the kettle more easily, is a perfect-no fuss match for the Aquasana filter system. It would be nice if Aquasana offered better quality faucets that have more height and depth.
Date published: 2018-04-09
Rated 5 out of 5 by from Great Flow Rate and a well engineered product. I have been a long time user of Aquasana products and they work very well. I upgraded to the larger capacity 3 stage filter because we use the filter for all of our drinking and cooking needs. We have "sulfur water" with the characteristic odor and taste. It does a great job of improving the water quality. The higher flow rate is a plus because we use it a lot in the morning for coffee , tea, drinking water and yes to fill our pet's water bowl. Thanks for a well engineered product that works well. Best regards, Canends
Date published: 2018-04-03
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Learn More

Aquasana FAQs

  1. Do I have to pay for a plumber to install the system?

    Our under counter drinking water filter systems are very easy to install, and it only takes a few minutes to do; no plumber is necessary. 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 how much do they cost?

    We recommend replacing the cartridges after six months or the specified gallon capacity to prevent the growth of bacteria in the system. The AQ-5100 Single Stage has a capacity of 200 gallons, the AQ-5200 Two-Stage has a capacity of 500 gallons, the AQ-5300 Three-Stage has a capacity of 600 gallons and the AQ-5300+ Three-Stage has a capacity of 800 gallons. Replacement filters cost $29.99 for the AQ-5100, $59.99 for the AQ-5200, $64.99 for the AQ-5300 or $79.99 for the AQ-5300+, but you can save 15%, get free shipping, and extend your product warranty by signing up for our no-contract auto-ship filter replacement program, Water for Life. The performance indicating device on the AQ-5200, AQ-5300 and AQ-5300+ systems will sound a beeping alarm and flash red when it is time to change your cartridges. The AQ-5300+ also contains Bluetooth connectivity so you can download our iPhone App and get alerts for when it is time to change your cartridges and even order new replacements straight from the App!

  3. Is this purified water?

    No, and actually, purified water is not as healthy as filtered water. Purified water undergoes reverse osmosis or distillation, which strip everything out of your water - not only the contaminants, but also the healthy, natural minerals. Our system uses selective filtration designed to reduce contaminants from the water and leave in the natural healthy minerals like calcium, potassium, and magnesium.

  4. How do I recycle the replacement filters?

    We have designed this system to minimize the environmental impact of our replacement elements, which are over 95% biodegradable carbon. Our company will recycle the filters for you, but we do not cover the shipping cost to return the filters back to us. In reality, the environmental impact of shipping the filters back to us outweighs the good of recycling. To recycle the drinking filters yourself, remove the ends of the filters, recycle the plastic parts (which are appropriately numbered) and put the carbon either in your compost pile or garden (carbon is good for plant life), or just throw it out (since the carbon degrades quickly, and is a positive component in a landfill).

  5. I'm a renter, so I can't drill or modify the plumbing. What should I do?

    To install an under counter system, you can remove the existing sprayer or soap dispenser on your sink and install our faucet in its place. This option will not damage or permanently modify your plumbing. When you move out, you can easily remove the system and reconnect your plumbing back to normal. If you do not have an existing hole in your sink from a sprayer or soap dispenser, we also have a countertop drinking water filter that conveniently screws on to most kitchen faucets.

  6. What is the size of the brass T-fitting for under counter and premium under counter unit?

    The most common size is 3/8" which originally comes with the system purchase. In rare cases some customers may need a 1/2" T-fitting which is sold separately and is available for purchase through technical support.

  7. What size hole do I need in my sink for the under counter and premium under counter systems?

    The faucet that is included with our systems requires a 1/2" hole.

  8. 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.

  9. What is BPA? And why are people concerned about it?

    BPA stands for Bisphenol-A, a contaminant found in most plastics. BPA can adversely affect your health if consumed at high levels. Aquasana drinking systems do not contain BPA, and our filtration process reduces existing BPA.

  10. Does having hard water mean it is contaminated?

    Hard water is more of a nuisance than a health risk, and is not necessarily contaminated. Most water sources in the USA are considered hard. Hard water is generally safe to drink, after it has been properly treated.

  11. What is soft water, and is it safe to drink?

    Having soft water just means you have a lower concentration of dissolved minerals in the water (primarily calcium and magnesium). Soft water does not mean clean water. Your water can be soft and still contain contaminants.

  12. What is selective filtration, and how do Aquasana systems filter drinking water?

    Selective filtration is the process of sub-micron filtration, micron filtration, adsorption and ion exchange, all of which selectively reduces chemicals, heavy particulates and most dangerous heavy metals from the water while maintaining healthy minerals like calcium, magnesium and potassium.

  13. What is the difference between the single-stage, 2-stage and 3-stage under counter systems?

    All of our drinking water systems use the same Aquasana Claryum® filtration technology. The single-stage system lasts 6 months or 200 gallons before the cartridges need to be replaced. Our 2- Stage system has a higher capacity than the single-stage, giving you 6 months or 500 gallons of clean, filtered water. The 3-Stage system includes a 20 micron pre-filter before the two Aquasana Claryum® filters. This pre-filter increases the capacity of the system from 500 gallons to 600 gallons. In addition, it improves flow rate in high sediment areas. The 3-Stage Max Flow system adds even more capacity to 800 gallons, a 44% increase in flow rate at .72 gallons per minute and Bluetooth connectivity for filter tracking.

  14. I have an existing side faucet from a previous system. Can I use that with my new Aquasana water filter?

    We recommend that you use the faucet provided. We have extensively tested the system with the faucets included. The faucets are NSF Certified to have no lead content. In addition, they will not impart any unwanted chemicals into your water. If you choose to use another faucet, we recommend that you have a plumber install the system to ensure no leakage occurs. We also recommend that you install an NSF Certified faucet to ensure the health benefits of your new Aquasana water filter.

Learn More

User Q & A

Does this system remove fluoride? Does it remove Chlorine?

Asked by: Gail71
All I can say is my water was a - ph level , had high iron content. My clear water clarity test from state came back in mid nineties but after the filter 3 stage install , my ph is a + 9.5 my test from state came back with a 99.90 clarity check , almost no sediments at all.  I am very satisfied with my unit.
Answered by: Shawndj01
Date published: 2018-04-20

Can this unit be turned off when filling water bucket for use of mopping?

Asked by: Iggygal
The system will not be tied into your main faucet, so that will not be necessary. The system comes with its own faucet that is tied into your cold water line. So you will have your main faucet, and then a separate beverage faucet that is connected to the filter. Thank you, Aquasana Customer Support
Answered by: Aquasana Customer Support
Date published: 2018-04-16

If I have used less than 800 gallons at 6 months do the filters still have to be replaced? If so, why?  Does the Bluetooth replacement notification trigger from a flow meter, pressure change or just from a calendar? 

Asked by: EJ12
We suggest replacing the filter in that system every 6 months. After 6 months we can no longer guarantee the performance will continue to meet the same filtration percentage reduction as the performance data. This is because after 6 months the filter will start to become over saturated and the media will start to degrade. Once the filter starts to degrade, you risk bacteria and mold growing inside the filter and the system: Heterotrophs (heterotrophic bacteria) are a group of microorganisms (yeast, molds & bacteria) that use organic carbon as food (as opposed to autotrophs like algae that use sunlight) and are found in every type of water. You can still use the filter longer than 6 months, however we cannot guarantee the results will be the same as the first 6 months. The internal monitor on the system should be triggered at 800 gallons OR 6 months, whichever occurs first. Thank you, Aquasana Customer Support
Answered by: Aquasana Customer Support
Date published: 2018-04-23

Does the AQ-5300 filter system adjust the alkalinity of the water? 

Asked by: Man N
Aquasana water filtration systems are not designed to alter the alkalinity of your water. While the ion exchange process may certainly help enhance the pH of your water, we can not guarantee a certain level. Thank you, Aquasana Customer Support
Answered by: Aquasana Customer Support
Date published: 2018-04-06

Does it remove arsenic and agricultural herbicide and fertilizer residues?

Asked by: DonD
Aquasana's Three Stage System is NSF Certified to reduce organic chemicals like herbicides, pesticides and VOC's. The Aquasana OptimH2O is NSF Certified to remove over 97% of arsenic from your drinking water. Thank you, Aquasana Customer Support
Answered by: Aquasana Customer Support
Date published: 2018-04-05

will the 3 stage under counter filtration system be able to be connected and have enough pressure for my ice maker? How does this system, specially FITTINGS AND CONNECTORS, perform under Las Vegas super high mineral contents?

Asked by: Lulu
I do not know about pressure for an ice maker, since I do not have one. I do not have a problem with high minerals, but where I live in NJ there is a high level of sediment in the water supply. After two months the filters had to be replaced. The solution was to install a pre-filter between the water supply and the 3 stage filter, supplied by Aquasana. So far after two and a half months the 3 stage filters are still going strong. 
Answered by: billdouglask
Date published: 2018-03-29

Is this okay for well water?

Asked by: Micky
Yes, I think it is okay for well water. Just keep in mind that the usage life of your filter depend on how impurity the well water is.
Answered by: Bradon
Date published: 2018-03-19

Rather than add an additional drinking water faucet, can i connect this to my existing sink faucet?

Asked by: NY Rick Robinson
I'm sure you could with the right plumbing connections. However if you plan on washing dishes, you won't have much pressure. Plus you would be wasting a lot of money having to buy extra filters if you used filtered water to do dishes.
Answered by: Cj37
Date published: 2018-02-24
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Pure Performance

Now connected with Bluetooth®