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 4.2 out of 5 by 75.
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50% OFF 3-STAGE MAX FLOW SYSTEMS - limited time!
  • MSRP: 349.98
  • Sale: 174.99

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

Questions? We can help

  • 866-662-6885

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.

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 Awesome product Very happy to have this product...save a lot of time and money. Looking forward for you guys to come up with graphene filtration system.
Date published: 2018-02-20
Rated 3 out of 5 by from Might Be Good I bought my filter a month ago, and have yet been able to try the water. Customer service is working with me, and I am expecting new filters. I hope that solves my "no water flow" problem, and then I can review this product.
Date published: 2018-02-19
Rated 5 out of 5 by from I'm enjoying the convenience I bought this a month ago and have been very satisfied
Date published: 2018-02-17
Rated 5 out of 5 by from Great system We installed this system in December 2017 and really like the flow rate and quality of the water. We had it installed by a Pro plumber. The only thing we noticed was that the hanging ears for the system are somewhat weak. OWe remedied that by pacing a small bax between the wall and the back side of the filters.
Date published: 2018-02-16
Rated 5 out of 5 by from Great tasting water We are on county water so our water has a chemical taste that gets strong at times. I installed this system for drinking, coffee and tea. We have been very pleased. It does not take up a lot of room and is a GREAT value for the price.
Date published: 2018-02-16
Rated 4 out of 5 by from Good Value-Great Tasting Water After some issues with the first unit due to a manufacturing error the system is working as designed. I would like a bit more water pressure. It takes longer than desired to fill a big pot but is sufficient for filling smaller jugs or glasses. The water tastes great! For the money this is simple to install and is a good value. Most importantly I feel confident the water is safe to drink.
Date published: 2018-02-15
Rated 5 out of 5 by from 3-Stage Under Counter Water Filter Max Flow We purchased 3-Stage Under Counter Water Filter Max Flow - Brushed Nickel and two shower filters from Aquasana. Filter was installed in the kitchen under the sink professionally and working beautifully. The unit was on sale and we were offered life long filter replacement at a reduced price. Previously I used to haul 5 gallon water jugs filled at local grocery. This installation not only reduced strain on my back hauling those water jugs but also reduced our over all drinking water cost. My wife and I likde the product so much, ordered two shower filters a few days later.
Date published: 2018-02-15
Rated 5 out of 5 by from Drinking Water Certified NSF P473 PFOA & PFOS In our area, we have a growing concern for PFOA & PFOS chemical contaminants in our well and city water. We were ecstatic to find this 3 stage under counter drinking water filter file from Aquasana that was one of the very few filters we found that is NSF Certified P473 to remove over 95% of PFOA & PFOS chemicals from our drinking water. This filer was easy to install and has greatly not only improved the taste of our drinking water but added confidence with the NSF P473 certification to reduce/remove PFOA & PFOS class of chemical contaminants. These class of chemicals have been commonly found in non-stick pans, Scott Guard, water proofing, fire suppression and other products and seem to be a growing problem nationally.
Date published: 2018-02-14
Rated 4 out of 5 by from Water taste is great Have very hard water. How do I order an extra stage one filter
Date published: 2018-02-11
Rated 5 out of 5 by from Best one yet! I recently up graded from the two stage to this and it was an amazing improvement. The water filters so much faster and tastes great.
Date published: 2018-02-09
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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

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

Asked by: NY Rick Robinson
No, I don't know how that would work.
Answered by: FuzzyZ
Date published: 2018-02-19

Is the 3-STAGE CLARYUM UNDER COUNTER MAX FLOW able to filter bacteria? I stay in Malaysia, is this water filter suitable for my country?

Asked by: Chee hua
I'm using one in the Philippines from the city water system and it's doing fine. There is a slight taste from the plastic piping here. If you really have a bacteria problem then you'll need some fine pre-filers and ultraviolet light. Which can get expensive.  But the Aquasana filters are better then any you can buy here.
Answered by: Delmar Rey
Date published: 2018-02-19

total dissolved solids, do your units take these out?

Asked by: LynnLee
If you want to reduce the TDS of your water you need to look at either distillation, or reverse osmosis. You really don't need to do this for drinking water.
Answered by: Aaron
Date published: 2018-02-19

Can I use install your filter system with my existing main kitchen faucet for both my hot and cold water? I would like to have filtered water for everything and I cannot put another faucet on the counter.

Asked by: AnneR
No. You can't use your kitchen faucet. The system isn't designed to do hot water.
Answered by: wrenchbender01
Date published: 2018-02-18

Does the 5300+ reduce radon in the drinking water? If so, to what levels? Also if you only ned 400 gallons in 6 months do I still need to replace the filters?

Asked by: BBB11
Activated carbon (also known as activated charcoal) is a common form of filtration for radon. Radon is not a contaminant that the NSF currently gives a certification on - so I can't give you a specific percentage, but would estimate around the 97% removal that is done on the other contaminants. The filters are certified for 800 gallons of water. We recommend replacement every 6 months to ensure system performance and contaminant removal. You can view a list of all contaminants removed here: http://cdn.aquasana.com/assets/AQ-5300_Performance_Data.pdf
Answered by: Aquasana Customer Support
Date published: 2018-01-15

Can the AQ-5300 be installed to serve a sink and adjacent refrigerator ice maker at the same time?

Asked by: Lisa Lucas
We have ours connected to the refrigerator water/ice maker as well as using it for our drinking (sink) water.  We have never run out or had a problem, even when we used it at Thanksgiving dinner with 20 guests, filling up water glasses for all, making coffee and for ice for our cosmopolitans!
Answered by: Mspmudd
Date published: 2018-01-15

Does the 3 Stage Claryum Undercounter System remove Fluoride?

Asked by: stjaggers
The only way to remove fluoride from your drinking water is through Reverse Osmosis. Our OptimH20 removes 95% of fluoride plus 87 additional contaminants including lead, mercury, asbestos, pharmaceuticals, pesticides, herbicides, and more. Feel free to check out our RO system here: https://www.aquasana.com/drinking-water-filter-systems/reverse-osmosis-claryum
Answered by: Aquasana Customer Support
Date published: 2018-01-11

Does the Aquasana Drinking Water Filtration System create healthful, stable alkaline pH in the drinking water? This along with minerals retention are what's most important to me.

Asked by: Clovia
Thank you for your interest in Aquasana.  While our systems can certainly help to enhance pH, they are not specifically designed to do so. The pH level of your water after flowing through our system will depend largely on the quality of your water. The system will not remove or reduce the mineral content of your water. In fact, we will add potassium in exchange for the harmful contaminants during the filtration process. Thank you, Aquasana Customer Support
Answered by: Aquasana Customer Support
Date published: 2018-01-05
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Pure Performance

Now connected with Bluetooth®