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 12.
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50% OFF 3-STAGE UNDER COUNTER SYSTEMS - limited time!
  • 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–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.

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 5 out of 5 by from Flow Rate! I bought this system as I was unhappy with my previous non-aquasana unit, mainly because the water came out in a trickle. I was impressed by the contaminant reduction of this system, but blown away by the flow-rate - it is so fast. We now use filtered water to fill up stock pots for cooking, not just for drinking, because of how fast the water flows. Awesome!
Date published: 2017-07-25
Rated 1 out of 5 by from Manufacturing Defect- Terrible Extremely slow water flow. Very difficult to install canisters. Spent a few hundred dollars to have a plumber install it. Now I have to pay him again to remove the system. Should pay for my plumbing costs!
Date published: 2017-09-17
Rated 5 out of 5 by from Fantastic water , great tasting plus ! We recieved and installed unit. Installation was simple , no leaks , everything to do the job. After running unit for 10 minutes as instructed I drank my first glass of water and it was great. Fresh clean and tasted much better than any bottle water I ever have drank. My wife then ran a ph test on water and we were blown away since our water was way below being neutral to a + 9.75 ph. We verified several test and we are very satisfied. We now are so convinced that we are planning on installing a complete well water system the first of the year. Aquasana 3 stage water system under the counter unit we purchased already has saved us money , will pay for itself plus we now are putting + ph water into our bodies which is a fantastic health thing to do. Thanks Aquasana great product.
Date published: 2017-09-13
Rated 4 out of 5 by from Good DIY installation, but... Good design for simple installation. Instructions were clear, but did not provide a couple of pointers - 1 - check your water feed to make sure you can connect to service before starting; and 2 - follow the instructions in order presented. The two plastic tubes cannot be pulled out of the unit once you have started pushing them in.
Date published: 2017-08-22
Rated 4 out of 5 by from New User replaced an RO unit. We purchased this system to replace an RO unit. The water quality is suitable to my wife who is the primary reason it was installed. The flow rate is good. We have opted for the 6 month filter replacement program. So far So good. Really need an additional 2' of tubing on each side for those with disposal etc.
Date published: 2017-09-01
Rated 5 out of 5 by from GREAT WATER FILTER SYSTEM!! I purchased this a few weeks ago and I am very happy that I did! It was rated highly and it was on special. The water tastes very good compared with the filtering systems I had before. Aquasana is highly rated and I highly recommended theirs systems to anyone looking for a new system!!!!
Date published: 2017-08-25
Rated 5 out of 5 by from So far so good Brand was recommended by doctor. Selected the auto ship program for filters to receive the discount. We had the unit installed. Counter spout appears to be of good quality. So far so good. Water tastes good and flow is acceptable. Hoping unit will be reliable and durable.
Date published: 2017-08-25
Rated 5 out of 5 by from Great tasting water We received this product almost a month ago and everyone in my family is happy with the great tasting of the water. We are happy we don't have to fill up big 5 gallon water bottles at the water store. Thank you for this product.
Date published: 2017-09-05
Rated 4 out of 5 by from Istallation wish a flat small spanner wrench was provided with the product to attach the unit to the sink. With such limited room under the sink adjustable wrenches are very difficult to use for proper securing.
Date published: 2017-09-05
Rated 5 out of 5 by from Water tastes great!` I purchased this product because the refrigerator filter just wasn't overcoming the chemical taste of the municipal water supply. Installation was very easy, and the water tastes great!
Date published: 2017-08-24
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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

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
 It took away the smell in my system immediately. All other the filters only lasted 2 to 3 maybe four weeks, I'm on the two months now with no change in water quality and no longer have the sulfur bad taste smell 
Answered by: Mjones
Date published: 2017-09-16

My plumber accidentally connected the filter (UNDER COUNTER WATER FILTER 3-STAGE MAX FLOW) to hot water line and we ran it for like 5mins. Has this damaged the filters?

Asked by: Ankur S
Hello, I hope you have been enjoying the system! If the hot water only ran for about 5 minutes, then your filters should be fine. Please let us know if you have any other questions going forward! Thank you, Aquasana Customer Support
Answered by: Aquasana Customer Support
Date published: 2017-09-15

What are the deminsions of the 3 stage under counter filter unit? 

Asked by: JoeB
Thank you for your interest in Aquasana! The under counter part of the system is 12" Wide, 4 1/2" Deep, and 12 7/8" High. Although you need to allow at least 14" total so you have room to remove and change the filter cartridges. Thank you, Aquasana Customer Support
Answered by: Aquasana Customer Support
Date published: 2017-09-15

I have 100 pounds pressure on my home plumbing. Will this be a problem with this filter system. I had the smaller Aquasana system many years ago and had to replace it because the pressure caused the filter containers to blow their caps.

Asked by: Fred Hazel
Hi Fred, thank you for your interest in Aquasana. Unfortunately this system has an operating pressure range of 20-80 PSI, so it is very likely that the high water pressure of your home will damage the system. You may be able to adjust the water pressure in your home, or have a plumber install a device to reduce the pressure though! Let us know if we can be of assistance going forward. Thank you, Aquasana Customer Support
Answered by: Aquasana Customer Support
Date published: 2017-09-15

Is any electrical work involved?

Asked by: Fabiana
No eletrical work is involved. Very easy install. 
Answered by: ZiNG
Date published: 2017-08-19

Where doe the battery for aq-5300 go?

Asked by: Sadykh
Hello! The battery of this system is inserted into the top of the manifold. If you run your finger along the top, you should feel a bump protruding from the system. Just pull that out and replace it with the new one every time you change your filters. I have attached a picture below as well. Please let us know if we can be of further assistance. Thank you, Aquasana Customer Support
Answered by: Aquasana Customer Support
Date published: 2017-08-19

Does this filter remove fluoride? (3 stage max flow)  If not what filters of yours do remove fluoride?  What is the waste ratio of your ro system?  thanks for your help 

Asked by: Nate
Hi Nate! The 5300+ system is not NSF certified to reduce or remove fluoride. For 95.7% fluoride reduction, check out our under counter Reverse Osmosis system- http://www.aquasana.com/drinking-water-filter-systems/reverse-osmosis-claryum. The waste ratio of the system is system 3:1, so for every 1 gallon of drinking water produced, 3 gallons are wasted. Please keep in mind that although waste water is not ideal, RO filtration technology is the most effective way to reduce fluoride and all RO systems will produce waste water. Thank you, Aquasana Customer Support
Answered by: Aquasana Customer Support
Date published: 2017-09-02

Does the Aquasana undercounter 3 stage filter system remove fluorides and if not could another filter be added to remove it?

Asked by: Gisela
Hi Gisela, The 5300 system is not NSF certified to reduce or remove fluoride. For 95.7% fluoride reduction, check out our under counter Reverse Osmosis system- http://www.aquasana.com/drinking-water-filter-systems/reverse-osmosis-claryum. Let us know if you have any other questions or concerns. Thank you, Aquasana Customer Support
Answered by: Aquasana Customer Support
Date published: 2017-08-18
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Pure Performance

Now connected with Bluetooth®