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.

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50% OFF 3-STAGE MAX FLOW 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: 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 Peace of mind Instillation was easy, the video was very helpful. I had some difficulty pushing the tubes all the way to their marked spots. There was leaking the first time because I hadn’t pushed the tubes in all the way, but I completed the tube insertion and it has worked great since then. My family has water I am comfortable with them drinking! It works great, with a great flow. Peace of mind
Date published: 2020-10-03
Rated 5 out of 5 by from Awesome It looks good and useful and no cursing to get installed lol
Date published: 2020-08-16
Rated 5 out of 5 by from The Best Water Filter that I know of! I absolutely love Aquasana. Great product! Easiest Install. Great tasting water. It was the water pressure flow that sold me on Aquasana. I had an under the sink water filter before, but it was dreadfully SLOW. I just couldn't take it anymore. The Aquasana pours out like a water socket should, and I'm so happy now. They have great customer service, too!
Date published: 2020-08-13
Rated 5 out of 5 by from Very Impressed...Hooked it to our new LG fridge Our little NH town water has always been subpar in taste, even though we have spent ten of millions on upgrades to water treatment. Our old fridge had just an internal filter, and it made the water okay. Since I was changing the water line anyway, I decided to buy this filter as a pre-filter to the fridge. Since our house has few shut offs, we hired a plumber friend to add a couple shut offs and properly install the Aquasana. We followed the directions of running a full 20 minutes before hooking to the fridge line. Then we ran 2 gallons from the fridge as that manual directed. In addition, we dumped the first 2 loads of ice. Since all that, I could not be more pleased with our water. No smell, no foul taste, and even the feel of the water in your mouth is pleasant. I read that some fridges don't mate well with the filter, but ours has been running flawlessly for 3 days now.
Date published: 2020-05-07
Rated 5 out of 5 by from Great tasting Very happy with this filter. No smell of chlorine and absolutely great tasting
Date published: 2020-04-30
Rated 5 out of 5 by from Working great I have had my water filter working for a month now. It's working great. Installation was very easy.
Date published: 2020-02-25
Rated 5 out of 5 by from Great filter! easy to install, clean fresh tasting non metallic tasting water with a sharp faucet!
Date published: 2020-02-23
Rated 5 out of 5 by from i am happy great tasting crystal clear water. i can fill a glass, put on top of my morning paper and can read through the water
Date published: 2020-02-01
Rated 5 out of 5 by from Easy install, smooth taste I finished the DIY setup in about 2 hours. Had to remove an old stubborn soap dispenser, so it took longer. I turned on the tap nervously, looked under the counter, and there were no leaks! That felt like enough to recommend the product right there. After letting it run for 20 minutes as directed, I tasted the water and it was smooth. There appeared to be little white specks floating around, but they disappeared after a few seconds and I realized they were just tiny bubbles. All in all, I'm happy with it. Even with the Max Flow model the flow rate is not that fast, but it's adequate. I have no clue whether our water is any "healthier", but it's giving me and my wife some peace of mind.
Date published: 2020-01-24
Rated 5 out of 5 by from Works great and easy to install System works great and was easy to follow instructions and install.
Date published: 2020-01-23
Rated 5 out of 5 by from Great Product and easy to install This product is awsome and very easy to install. The water is very clean, refreshing and tastes great. Filters lasted more than 8 months. The Andriod app helps a filter life remaining. Great product
Date published: 2019-12-24
Rated 5 out of 5 by from Owned 1 1/2 years. Works great, third filter replacement, no issues, no leaks. !00% satisfied.
Date published: 2019-11-28
Rated 5 out of 5 by from Quick and easy to hook up Installation went smooth and easy. The quality of the drinking water is good. So far so good, we are happy with this product.
Date published: 2019-11-16
Rated 5 out of 5 by from Great product, great tasting water When we did a kitchen remodel we wanted an undersink filter to replace the countertop pitchers we were using. After much research, we decided on Aquasana. The installation was easy, the water tastes great and the filters lasted six months. We get new filters with the Water for Life program and they are simple to replace. We use the water for drinking, cooking, the coffee maker and our cats’ drinking water. We love it!
Date published: 2019-10-19
Rated 5 out of 5 by from works great-no issues to date-upped water pressure Really enjoy water quality, peace of mind of pure water
Date published: 2019-10-04
Rated 5 out of 5 by from AWESOME-Never knew water could taste so good. I love this filter, it was simple to install and the results are amazing. My water now is clean and tastes refreshing, I have used the water to cook with and food also tastes better.
Date published: 2019-09-22
Rated 5 out of 5 by from Extremely satisfied - amazing difference!! The clarity and quality of the well water in our cabin has declined over the years, to the point that due to the appearance and odor, it is barely usable, and we had resorted to bottled water for almost everything. Installed the 3-stage under counter filter under the kitchen sink (simple and straighforward installation) and the results are simply amazing. See for yourself in the attached photo. I don't think I'll want to ever use unfiltered water in the kitchen sink again. Just placed an order for the shower filter, and will be installing that and a countertop filter in the bathroom shortly. Thanks Aquasana!!
Date published: 2019-08-19
Rated 5 out of 5 by from Impressed with Aquasana ease of install Really love the new water filter system. Installation very easy. Water tests great.
Date published: 2019-08-09
Rated 5 out of 5 by from Aquasana The filter was easy to install and the water tastes like air.
Date published: 2019-06-10
Rated 5 out of 5 by from Excellent product This replace an older different brand. This unit was easy to install takes up no counter space and has a great water flow.
Date published: 2019-05-24
Rated 5 out of 5 by from Excellent water quality. More than satisfied with the system. I had a plumber install it and that worked best for my situation. Will get the shower filter next!
Date published: 2019-05-03
Rated 5 out of 5 by from Aquasana max flow system. The unit is easy to install. The faucet is well made and doesn't clutter up the sink area. The volume of water being filtered is adequate for our needs for cooking and drinking on demand.
Date published: 2019-04-08
Rated 5 out of 5 by from Very good product Water looks and taste good. Nice faucet. Filters will be easy to change.
Date published: 2019-04-04
Rated 5 out of 5 by from Love my new fresh water, but tech needs work The installation process was difficult because our plumbing sizing did not match well with the Aquasana system. It required troubleshooting and a few trips to the hardware store, but we got it going! The water tastes amazing and the flow rate is great. Our only complaint is the tech/app is really terrible. I thought we would be able to track our filter life but I could even get my account set up on the app without crashing and my husband couldn't even get far enough to download it successfully. It's not a deal breaker, but very disappointing.
Date published: 2019-03-20
Rated 5 out of 5 by from Photontraveler Very easy install. If you can follow the excellent directions you can install this product. We have hard well water and live in a rural farming area. but now my family and my pets love the taste of the water.
Date published: 2019-03-02
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
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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 (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

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

I was curious, I'm looking at buying the AQ 5300 and I wanted to know how often the filters typically need replacing? I know its based on water usage but any reporting done on estimated time frame for a filter's life with normal consumption?

Asked by: KyleC
Hello, Thank you for contacting us. The filters for the AQ-5200 last up to 6-months before needing the filter to be changed. If you have any further questions feel free to contact us at 866-662-6885. Thank you, Aquasana Customer Support
Answered by: Aquasana S
Date published: 2020-06-11
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