Under Counter Water Filter
3-stage Max Flow

The best performing water filter now with 44% faster water flow and 800 gallons of filter life capacity.

Select a faucet finish: Chrome
  • all-metal brushed nickel faucet
  • all-metal chrome faucet
  • oil rubbed bronze faucet
3-Stage Under Counter Water Filter Max Flow - Chrome is rated 4.3 out of 5 by 208.
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50% OFF 3-STAGE MAX FLOW SYSTEMS until Oct 31
  • 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–8PM CDT
  • 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

Stylish
Designer Faucet

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

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 Simple and good. The biggest problem I've had with filters in the past is the water flow; it always is so slow. This unit is much faster. It's also very simple to install and use; the alarm feature to remind you about filter change time is most convenient and you don't have to guess anymore. Very pleased and would highly recommend.
Date published: 2020-10-21
Rated 5 out of 5 by from Great addition Smoothly, my husband installed our water filter in the sink hole where the soap dispenser was located. Brushed nickel matched our faucet. The flow is a little slow but I don't care since the taste of the water is supreme, even with the whole house water system we have. We do not have reverse osmosis filtering, that uses too much water. Good buy!
Date published: 2020-10-20
Rated 5 out of 5 by from Clean and refreshing water Love it! Peace of mind that I'm drinking clean water. Easy to just turn on faucet and fill my bottle at any time.
Date published: 2020-10-18
Rated 5 out of 5 by from great final stage filter. Improves my water taste. I enjoy the clean taste and smell. My handyman installed the unit in a matter of 30 minutes and the faucet is very heavy duty and attractive. I had one of these installed where I work and after tasting the difference it made, ordered one for my house also. We both have whole house systems from Aquasana also.
Date published: 2020-10-13
Rated 5 out of 5 by from Clean-tasting water! Fairly east to install. Great-tasting water. I highly recommend Aquasana.
Date published: 2020-10-08
Rated 5 out of 5 by from Does not take alot of room It brings peace of mind with great tasting water. Filters out chlorine in your water.
Date published: 2020-10-05
Rated 5 out of 5 by from Removed the dirt taste from my water Our water company says there is nothing wrong with our water, but it tastes and smells like dirt. This filter removes the smell and taste of dirt!
Date published: 2020-10-05
Rated 5 out of 5 by from Perfect replacement for prior system We are very happy with the Aquasana 3-stage under counter system. Is is very similar to the system we replaced (we could no longer find replacement filters). The installation instructions were very easy to understand and was installed quickly. Our unfiltered water is very hard and has strong chemical taste. the unit produced wonderfully clear water with no odor or taste--the way good water tastes from a great, fast-running alpine stream!
Date published: 2020-10-04
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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.

  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 for 800 gallons of filter life and a 44% increase in flow rate at .72 gallons per minute.

  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

Is it possible to rotate the handle on the faucet? I would like it to point up rather than down. Most handles have small screws inside to do this but didnt see one here

Asked by: JR22
Hello, We would love to transfer this to a team specialist who is best-suited to answer any questions or concerns you may have. Kindly email us directly at support@aquasana.com or contact us directly at 866-662-6885, Monday thru Friday from 8am-5pm CST. Thank you, Aquasana Customer Support
Answered by: Aquasana S
Date published: 2020-10-23

Do the brass fittings have lead? What is the composition of the included brass fittings?

Asked by: istherelead
Hello, Thank you for your question. Our 3-stage max flow is 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 https://cdn.aquasana.com/assets/AQ-5300+_Performance_Data.pdf?_ga=2.134348665.927680204.1600694812-773233525.1590676156&_gac=1.95168238.1600780583.CjwKCAjwwab7BRBAEiwAapqpTK9F_uyGJH5scBTHS3TtzoqW1ddaO_uU6t1tNtrnnRRv-sG8VhjOHxoCOq4QAvD_BwE If you need further assistance contact us at 866-662-6885. Thank you, Aquasana Customer Support
Answered by: Aquasana S
Date published: 2020-09-22

If we install this under the sink, can we fill those 5 gallon jugs with the filtered water and use it on our water machine?

Asked by: Peachy
Yes you can, however this is designed to fill up a glass as a time, not a lot of pressure coming out. So it would take a while. We fill up small glass bottles and have them in the refrigerator to grab as needed. You might try a whole house system instead.
Answered by: BlakeA
Date published: 2020-09-01

Do they sell replacement parts? One of the cartridge holders (sump) broke as I was trying to insert it. I couldn't find a parts section on the website. 

Asked by: Nick too
Hello, Thank you for your question. Yes, we do carry replacement parts please contact us at 866-662-6885 to help further assist. Thank you, Customer Support
Answered by: Aquasana S
Date published: 2020-08-28

Where do you get the filters from and what is the cost?

Asked by: Daisy may
Hello, Thank you for your question. I have provided link down below for replacement filters. https://www.aquasana.com/replacement-water-filters If you have any questions feel free to contact us at 866-662-6885 Thank you, Aquasana Support
Answered by: Aquasana S
Date published: 2020-08-21

Will the Claryum 3 stage max flow filter out copper? Thanks.

Asked by: Geester
Hello, We would love to transfer this to a team specialist who is best-suited to answer any questions or concerns you may have.   Kindly email us directly at support@aquasana.com or contact us directly at 866-662-6885, Monday thru Friday from 8am-6pm CST, and weekends from 9am-5pm CST.   Thank you,   Aquasana Support  
Answered by: Aquasana S
Date published: 2020-08-21

Can I get a smaller faucet? The one it comes with is too tall for my purpose. I currently have a handheld sprayer next to my regular faucet (which I’m replacing with a built in sprayer). It would look silly with two large faucets next to each other.

Asked by: JasonH
Hello, 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 Best, Aquasana Customer Support 866.662.6885 Option 1 www.aquasana.com
Answered by: Aquasana S
Date published: 2020-07-29

Into my 3rd year with an under sink 3 stage max flow and replacement filter subscription.  It has been working great.  I just noticed a small leak on the top of the 3g tank.  Not at the connection but at the stem.  Is there a warranty for this? 

Asked by: DudeInCal
Good Morning, Thank you for reaching out! We appreciate you taking the time to share your concerns!   We would love to transfer this to a team specialist who is best-suited to answer any questions or concerns you may have.   Kindly email us directly at support@aquasana.com or contact us directly at 866-662-6885, Monday thru Friday from 8am-5pm CST, and weekends from 9am-5pm CST.   Thank you,   Aquasana Support
Answered by: Aquasana S
Date published: 2020-06-30
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