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 4.3 out of 5 by 28.
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50% OFF 3-STAGE UNDER COUNTER SYSTEMS until Oct 23
  • 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: 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.

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
  • Apple App Store for iOS
  • Bluetooth device

How It Works

Superior Filtration

Selective Claryum® Filtration

Reduces 68 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 certified to NSF/ANSI Standards 42, 53, 401 + P473.

  • 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 1 out of 5 by from Worked for maybe 2 hours Hooked it up and it worked a total of maybe 2 hours. Water flow was fine but then it suddenly stopped. Called Customer service who sent new filters. That didnt worked. Now sending new system. Customer service has been good but really frustrated with system. It's been two weeks and cannot use it.
Date published: 2017-10-17
Rated 4 out of 5 by from Great taste Easy install, quality materials, water taste great.
Date published: 2017-10-10
Rated 4 out of 5 by from Great water Water tastes Great! Install was easy for me. My only issue is that the don't have an android app yet. Also, the faucet could stick out a little further over the sink.
Date published: 2017-10-09
Rated 5 out of 5 by from 3-Stage Under Counter Water Filter Max Flow- A shorter features/smaller in volume than my previous ones.
Date published: 2017-09-30
Rated 4 out of 5 by from Works nicely, but... This is my 3rd RO under sink RO unit, and I generally think I'll be happy. Water tastes great. Only thing is that the water pressure doesn't feel particularly strong (which I was hoping for).
Date published: 2017-09-29
Rated 5 out of 5 by from Fabulous water! It is so easy to use and the water tasted delicious.
Date published: 2017-09-28
Rated 5 out of 5 by from Clean Water Easy to install and we are experiencing less worry and anxiety over the recently discovered ground water contamination found in ours neighborhood.
Date published: 2017-09-27
Rated 5 out of 5 by from As expected This system is pretty much what I expected. Works well. Flow rate is a bit slower than expected but not horrible.
Date published: 2017-09-27
Rated 2 out of 5 by from Flow is NOT "max" as expected First, they sent the wrong parts, so I had to to go to Home Depot to buy a 3/8" coupler versus a 1/4" (they sent 2 of those, instead of 1 of each side) - super annoying. This was after I was on hold with my water turned off for like 40 minutes - I just gave up. Second, I bought this a month ago, after my father bought the smaller version (the only difference is these filters are bigger/taller). It takes up a lot of space under the sink - my father couldn't even fit this model under his sink. But it was advertised as "max flow" and his system takes forever to fill up a water jug, so I paid the extra money for this one. I think it is actually SLOWER than the smaller model, and my water pressure is much stronger than my father's house. So pretty disappointed.
Date published: 2017-09-26
Rated 5 out of 5 by from Under sink filter Bought for cooking and drinking water, very happy with the result.
Date published: 2017-09-22
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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 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

Our city was just put under a boil water alert. Do we need to replace the filters after the alert is lifted?

Asked by: boxermom
Hello! When the boil notice has ended, we do suggest changing the filters just to be safe. Thank you, Aquasana Customer Support
Answered by: Aquasana Customer Support
Date published: 2017-10-12

Hi, which is the shipping weight with the box?????

Asked by: Delta
Hello! This system weighs about 10 pounds Thank you, Aquasana Customer Support
Answered by: Aquasana Customer Support
Date published: 2017-10-12

Does the under the sink 5300 model remove any or all of the radioactivity contamination that naturally occurs or from the nuclear accident in Japan?

Asked by: Jimguy
Actually - you only need to worry about the radiation if you live next to nuclear reactor - and are using the water affected by that accident. This filter will not address radioactive particulates - but sure does provide some clear tasty water when combined with your local water purification facilities. Also - most of the radioactive contamination has been addressed by Godzilla and Mothra.
Answered by: ABBK
Date published: 2017-10-12

what is #58 that is only included in the R.O?

Asked by: CarLy
Thank you for your interest in Aquasana! NSF/ ANSI 58 includes contaminants such as fluoride, chromium 6, Arsenic and nitrates) for a full list of contaminants, you can view the performance data sheets here: http://www.aquasana.com/performance Thank you, Aquasana Customer Support
Answered by: Aquasana Customer Support
Date published: 2017-10-03

I'm interested in the under the counter 3 stage maximum flow filter system, and appreciate if you can tell me where are the retail outlets that carry and install the product.  

Asked by: Eric2017
Thank you for your interest in Aquasana! Unfortunately our products can not be purchased in stores at this time. Since this is our newest product it is not yet available online for Home Depot Canada. However, you can purchase directly from Aquasana.com, and we will be happy to ship directly to you. Thank you, Aquasana Customer Support
Answered by: Aquasana Customer Support
Date published: 2017-10-03

I have bought a an AQ-5300+ Under Counter Water Filter on amazon a week ago.Unfortunately,I lost the 3/8'' white tube. How can I bought it again?

Asked by: zhang jing
Hello! For replacement parts please contact Aquasana Customer Service at 866.662.6885 and anyone here will be happy to assist. Thank you, Aquasana Customer Support
Answered by: Aquasana Customer Support
Date published: 2017-10-03

I have a well and the water has a lot of iron. This causes it to tast bad and smell. Will this system correct my problem?  

Asked by: Doyles16
Thank you for your interest in Aquasana! While this system will certainly help with reduction of heavy metals such as iron, it is not NSF certified to do so, as the level of reduction is not high enough to meet the certification standards. We do have a whole home option for iron reduction. If you would like more information on our iron tank, just give us a call at 866.662.6885 and a member of the team will be happy to help. Thank you, Aquasana Customer Support
Answered by: Aquasana Customer Support
Date published: 2017-10-03

We have well water so may need to replace the pre-filter more often than the other two on the 5300+ model. It looks like the filters only come in sets of three. Is it possible to purchase the pre-filter alone?

Asked by: mm3908
Thank you for your interest in Aquasana! Since you are on well water, our suggestion would be to look into our Reverse Osmosis system. It is much better suited for the reduction of the hard minerals and heavy metals often found in well water. We do not really sell the pre filters for this system individually, however if you opt for this system and find that the filter is clogged, our service team can certainly place an order for a spare pre filter. Thank you, Aquasana Customer Support
Answered by: Aquasana Customer Support
Date published: 2017-10-03
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Pure Performance

Now connected with Bluetooth®