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 155.
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50% OFF 3-STAGE MAX FLOW SYSTEMS - ends today!
  • MSRP: 349.98
  • Sale: 174.99

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

Questions? We can help

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

Stylish
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

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 Aquasana The filter was easy to install and the water tastes like air.
Date published: 2019-06-10
Rated 5 out of 5 by from Excellent product This replace an older different brand. This unit was easy to install takes up no counter space and has a great water flow.
Date published: 2019-05-24
Rated 5 out of 5 by from Excellent water quality. More than satisfied with the system. I had a plumber install it and that worked best for my situation. Will get the shower filter next!
Date published: 2019-05-03
Rated 5 out of 5 by from Aquasana max flow system. The unit is easy to install. The faucet is well made and doesn't clutter up the sink area. The volume of water being filtered is adequate for our needs for cooking and drinking on demand.
Date published: 2019-04-08
Rated 5 out of 5 by from Very good product Water looks and taste good. Nice faucet. Filters will be easy to change.
Date published: 2019-04-04
Rated 5 out of 5 by from Love my new fresh water, but tech needs work The installation process was difficult because our plumbing sizing did not match well with the Aquasana system. It required troubleshooting and a few trips to the hardware store, but we got it going! The water tastes amazing and the flow rate is great. Our only complaint is the tech/app is really terrible. I thought we would be able to track our filter life but I could even get my account set up on the app without crashing and my husband couldn't even get far enough to download it successfully. It's not a deal breaker, but very disappointing.
Date published: 2019-03-20
Rated 5 out of 5 by from Photontraveler Very easy install. If you can follow the excellent directions you can install this product. We have hard well water and live in a rural farming area. but now my family and my pets love the taste of the water.
Date published: 2019-03-02
Rated 5 out of 5 by from Great taste! Delivery was quick and so was installation. I already had an Amway water filter with similar connections hooked up. The taste was great. The only down side was even though I purchased the max flow 3 stage filter, it was slower than our old one stage Amway filter. Other than that, it is a great filter.
Date published: 2019-01-30
Rated 5 out of 5 by from Easy to install and operate. I enjoyed the filter and it’s convenience a lot. I would improve on faucet quality : make the bottom metal part covering the hole a bit bigger.
Date published: 2019-01-24
Rated 5 out of 5 by from Best tasting water I've had in years! Product was easy to install, good directions. It fit perfectly in the soap dispenser cutout in my sink. I would recommend to everyone.
Date published: 2019-01-20
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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 (three months for the single-stage system) 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

Do under counter filters for drinking water remove microplastics

Asked by: Kaffee
Kaffee, Aquasana drinking filters are certified by the NSF to remove contaminants down to 0.5 microns. However, our systems have not been NSF Certified for the reduction/removal of microplastics in the drinking water. For any other questions or concerns, our team members are available at 866-662-6885, Monday thru Friday from 8am-6pm CST, and weekends from 9am-5pm CST. -Aquasana Customer Support
Answered by: -ACS
Date published: 2019-06-14

What are the 79 contaminants that are filtered out?

Asked by: Teddy
Hello Teddy, Thank you for your question. I have attached a link down below with the performance data. http://cdn.aquasana.com/assets/AQ-5300+_Performance_Data.pdf?_ga=2.230287516.1403252651.1559069485-1576935854.1541435505 Thank you, Aquasana Support
Answered by: Aquasana S
Date published: 2019-05-29

What are AQ-5300 Filter Unit height x width x depth dimensions?

Asked by: Wojtek
Hello! The Width – 12” Depth – 4 ½” Height – 12 7/8” Install Height – 14” for cartridge replacement. Thank you, Aquasana Customer Support
Answered by: Aquasana S
Date published: 2019-04-30

Hi, I have been using the AQ-5300+ 3-STAGE UNDER COUNTER WATER FILTER.MAX FLOW, a bit over 6 months now. But the filter system has not beeped or flashed. Should I wait till the alarm goes on or just replace the filters?

Asked by: Carriehed
Hi, I have been using the system for over a year and a half and I am on the auto replacement. It has never beeped or flashed before, I have just replaced the filters when they are sent. This month the system beeps when I turn on the tap so I know it is getting close to needing a replacement. Hope this answers your question.
Answered by: Stacylacy
Date published: 2019-04-22

Can I avoid the faucet this system comes with? I have a commercial 3 compartment sink. The faucet with Sprayer is mounted on the sink backsplash. I would want to use that faucet correct?

Asked by: chrissieJ
yes if you have a separate spray in one you can use that one. but if you have a 3 hole sink like one that has a soap dispenser you can use that one too. when you install it has a 2 way for the cold water supply so you could keep the sprayer too
Answered by: boy named soo
Date published: 2019-05-06

What is the counter maximum thickness on which the AQ-5300+ can be mounted?

Asked by: JedLev
I'd say 2 1/4 inch. If you got creative and used the compression nut only (I would definitely not recommend that), you might be able to go as thick as 2 1/2. This is of course if they are using the same faucet as any drinking faucet could technically be used
Answered by: Cjcj
Date published: 2019-04-13

If I purchase an Aquasana Whole House Filtration system do I also need an under the counter system as well? It seems to me the whole house filter should be all I need.

Asked by: SarainDallas
Depends on what you want to remove and the % of filtration of your water source. I purchased and use both.
Answered by: Roughneck 8
Date published: 2019-03-27

Where can I find the full list of contaminants this filters?

Asked by: liza
Hello Liza, Thank you for your question. I have provided a link below for our performance data sheet. http://cdn.aquasana.com/assets/AQ-5300+_Performance_Data.pdf?_ga=2.182788902.1882973885.1552571438-1200308807.1531403043 If you have any further questions please contact us at 866-662-6885. Thank you, Aquasana Support
Answered by: Aquasana S
Date published: 2019-03-15
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Pure Performance

Now connected with Bluetooth®