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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: 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 242.
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  • MSRP: 349.98

Save 20% + free shipping with Water for Life $279.98

Questions? We can help

  • 866-662-6885
  • MON–FRI: 8AM–7PM CST
  • SAT: 9AM–5PM CST

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 Great System, Simple Install The product produces great tasting water. It is very simple to install with clear instructions. I highly recommend.
Date published: 2021-01-06
Rated 5 out of 5 by from Tastes great Your 3 stage water filter system has truly made a difference in the taste of our town water
Date published: 2021-01-06
Rated 5 out of 5 by from Bobby's water filter Very neat install and easy. Good looking and doesn't take up too much space.
Date published: 2021-01-04
Rated 5 out of 5 by from Great filter Easy to install. Great tasting water, good flow, better faucet than older models, good quality all around.
Date published: 2021-01-04
Rated 5 out of 5 by from Great tasting water I really like my new water filtering system. The water taste clean and refreshing.
Date published: 2020-12-31
Rated 5 out of 5 by from Best tasting filtered water, period. Fairly easy to install. Arrived in timely fashion.
Date published: 2020-12-27
Rated 5 out of 5 by from Happy all around!! I have been an Aquasana customer for a number of years now. I recently decided to upgrade my under counter system from a simple two stage to a Max Flow 3 stage. The increase in flow was quite noticeable! After installation I noticed a slight leak coming from the connection between the cartridge and the receiver unit on two of the cartridges. I contacted customer service who advised me to shut off the waterflow immediately. She then stated she was sending out two new replacement parts for the filters. Upon receiving them I replaced the new filters into the receiver and the problem was solved!! The customer service was knowledgeable and excellent!! I look forward to many more years using the automated filter replacement program. It's the best reminder that it's time to replace the filters!!! :-)
Date published: 2020-12-23
Rated 5 out of 5 by from Very impressive product The water filter is great. Installation was very easy and did not take too much time. The taste is great and I am glad I can provide my family with clean water. Promote Green...Stay away from bottle water.
Date published: 2020-12-22
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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

I purchased my unit at Home Depot. Can I still signup for your filter purchase program ?

Asked by: Ceros Roman nose
Anyone can sign up for the filter program.
Answered by: Mick
Date published: 2021-01-14

can i buy the filter system elsewhere and the water for life membership from aquasana?

Asked by: chiporter
Hello, Thank you for contacting us. Yes, you can enroll in our water for life program contact us at 866-662-6885 to help further discuss. Thank you, Aquasana Customer Support
Answered by: Aquasana S
Date published: 2021-01-07

Does this lower the TDS level in my water? 

Asked by: SammyL
Scroll down to the AQUASANA FAQS, #8 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. Also, click on the "Performance Data Sheet" link. (https://cdn.aquasana.com/assets/AQ-5300+_Performance_Data.pdf?_ga=2.162538943.264268206.1609795455-159174886.1607658554)
Answered by: Tim.keenan
Date published: 2021-01-06

Hi. The small o-rings on the cartridge cap that screws into the manifold have become misshapen. Can you advise what size replacement o-rings I need to buy to replace these?

Asked by: LoveFilterWater
Note this question is regarding the A5300+ Max Flow under counter water filter system
Answered by: LoveFilterWater
Date published: 2020-12-26

Hello! I’m interested in buying the three stage water filtration high flow system and wanted to ask if it wasted water to make water? I read that RO systems waste water, sometimes 1.5 gallon to 1 gallon drinkable. Hope to hear an answer and thanks!

Asked by: Casey in Carmichael
I don't feel that it wastes wastes water at all,but I have to be honest,I have not really done a test to be sure.
Answered by: Mark Brown
Date published: 2020-12-17

I am planning to put Aquasana 5300+ for my brand new home. I have a Granite countertop and I have to provide Drilling instructions. So How wide the Drill should be into the Granite? I have got mixed answers, can an expert please clarify?

Asked by: Alok
Good Morning, Thank you for reaching out to us. The faucet that is included with our systems requires a 1/2" hole. If you have any further questions feel free to contact us at 866-662-6885 or email us at info@aquasana.com Thank you, Aquasana Support
Answered by: Aquasana S
Date published: 2020-12-11

Hi, where can I find a comprehensive list of everything that is filtered out by this system? Also, does this filtration system filter out BPA? Thank you

Asked by: Jaxie
On the 3-stage system https://www.aquasana.com/drinking-water-filter-systems/under-counter-faucet-3-stage-max-flow. You can click on the link titled "Performance Data Sheet".It does state that it filters out BPA. NSF/ANSI 401 Maximum Concentration Minimum Reduction Overall % Reduction Results Bisphenol A 300 ng/L 98.80% 98.9% Pass
Answered by: Tim.keenan
Date published: 2020-12-12

Does this system help remove or at least reduce residual salt from a salt water softener house system?

Asked by: Eagle
Hello, We appreciate your question. The AQ-5300+ Max Flow System is NSF 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 Unfortunately, the AQ-5300+ will not help reduce nor remove salt residual from a Salt-Based Softener. -Aquasana
Answered by: -ACS
Date published: 2020-11-30
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