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: 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 4.4 out of 5 by 145.
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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

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

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 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
Rated 5 out of 5 by from What good tasting water tastes like The taste says it all. Our water system is a small resort owned operation. We have seasonal "spikes" in the chlorine added to the system because of the seasonal fluctuation of people and water flow. The Aquasana system has taken care of that. Installation was not a problem. Took about 3 hours. The only "surprise was the backflush/water noise it makes when it cycles and fills the reservoir. We have to plan and fill everything at night so my wife doesn't have to listen the noise it makes in the drain during breakfast. Small adjustment for water that tastes this good.
Date published: 2019-01-15
Rated 5 out of 5 by from Fantastic filtration, slow flow We love this filtration system and installed it in our new kitchen 6 months ago because our city's water is full of chorine, chlorine byproducts and has been known to have other contaminants as well. The taste of this filtered water is better than bottled spring water and I love knowing my family is drinking clean, healthy water. It was super easy to install under the sink but the flow was really slow. Annoyingly slow. So our plumber installed a small storage tank in the basement on a rack attached to the ceiling. It's a reverse osmosis tank and stays filled with the filtered water from the aquasana system above so that when we turn on the faucet, the pressure is always strong. The kids can fill up their water bottles in a snap and a pitcher fills up as fast as from the main kitchen faucet. I also purchased a separate faucet fixture because I didn't love the look of the aquasana one. It ended up being the perfect set-up for us and I'd recommend the Aquasana system to anyone.
Date published: 2019-01-12
Rated 5 out of 5 by from Overall impression Easy installation, decent water flow, good taste and no odor or after taste.
Date published: 2019-01-06
Rated 5 out of 5 by from Great! Installing was not too bad except we forgot to install the flow restrictor (noisy). Customer service was great in helping us get it working correctly.
Date published: 2019-01-05
Rated 5 out of 5 by from Does an excellent job Loving the filter, I installed it myself it was a breeze, tested water and there are no contaminants what so ever. True piece of mind
Date published: 2019-01-03
Rated 5 out of 5 by from First Impression We’ve only had our system installed for a couple months but so far we’re pleased with the quality of the equipment and the water results.
Date published: 2018-12-31
Rated 5 out of 5 by from Worth the effort, but took a lot of effort! I love the clean taste and the peace of mind knowing that my water is clean. I wish I could filter out the floride. I have the under counter unit as well as the shower filter. The first person installed the under counter with great difficulty. There was no water flow. I watched the video and called Aquasana customer support for assistance, more than once. The next morning I discovered a leak under the sink. I called the top local plumber and he RE-installed. Install was not easy. Install was expensive ($200). An additional expense is (if you need it) cutting a hole in the countertop ($150 minimum) or purchasing a new faucet with spray device on faucet and using existing hole in granite where previous sprayer was. New faucet was $125, and I needed the first installer to do that...you see the pattern here. The least expensive part of the project was the Aquasana unit. The unit has been fine, running well, good stream and great taste. I recommend this product to those with the means to hire someone to install it.
Date published: 2018-12-30
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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

Why does water flow get so slow?

Asked by: Concerned consumer
Hello, It appears your questions would best be answered by a consultation with one of our experts over the phone. Please call our department at 866-662-6885, to help find a solution for your system. Thank you, Aquasana Support
Answered by: Aquasana S
Date published: 2019-02-11

I have already purchased an air gap NSF certified faucet for our sink (thinking we were going to go with a RO system) however we don't have room for the tank. Will the 3 stage 5300 system work with the air gap faucet?

Asked by: Cakes
Hello, All Aquasana's Under Counter systems include a faucet. Because our NSF Certification requires every part of our system to be tested and certified, we can only guarantee our Certification with our components. However, you are welcome to use any cold water faucet you choose, it will not affect the price of the system. If you have any further questions please contact us at Support@aquasana.com Thank you, Aquasana Support
Answered by: Aquasana S
Date published: 2019-02-11

Our app (iphone) says our filter is completely expired, but, it was installed only 3 months ago, making me think the filter is still fine. Could this be a syncing issue - or something with the battery in the filter? How to resolve and know for sure?

Asked by: She Likes Clean Water
Hello, Thank you for your questions. I am happy to assist please contact us at Support@aquasana.com to help resolve the issue. Thank you, Aquasana Support
Answered by: Aquasana S
Date published: 2019-02-05

Do all three filters need to be replace each time?

Asked by: Aznayc
Hello, The AQ-5300 filters need to be replaced when system reaches 600 gallons or at the 6-month mark. Kindly keep in mind the AQ-5300 system will sound a beeping alarm and flash when it is time to change your filters. Thank you, Aquasana Support
Answered by: Aquasana S
Date published: 2019-01-29

When do I replace my 3 stage filter?  I was planning on the Bluetooth based app to tell me but it crashes every time I try to open it.  How do I know when the filter needs to be changed?

Asked by: Gwenbert
Hello Gwenbert, The AQ-5300 filters need to be replaced when system reaches 600 gallons or at the 6-month mark. Kindly keep in mind the AQ-5300 system will sound a beeping alarm and flash when it is time to change your filters. Thank you, Aquasana Support
Answered by: Aquasana S
Date published: 2019-01-04

Does this unit have a tank or it doesn't need one?

Asked by: pcverik
No, it doesn’t have or need a tank to function unless you don’t have water piping.
Answered by: Mr Dedera
Date published: 2018-12-20

My Aquasana faucett has developed a slow drip after about a year of use. Can the valve be replaced?

Asked by: RPDJR
they have parts online, but id bet aquasana would give you a new one. they are pretty good like that. they want life long customers 
Answered by: boy named soo
Date published: 2018-11-26

Are there filter elements included with the purchase of the system?

Asked by: Potable water
Yes. I also signed up for water for life and have filters automatically sent 
Answered by: Monk
Date published: 2018-11-24
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Pure Performance

Now connected with Bluetooth®