2-stage Under Counter Water Filter Upgrade

Get a new housing and filters with Water for Life.

AQ-4035 water filter

AQ-4035 Replacement Cartridge for the AQ-4600 and AQ-4601 Shop Now

Select a faucet finish: No New Faucet
2-Stage Upgrade is rated 4.1 out of 5 by 77.
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  • MSRP: 159.99

Save 20% + free shipping with Water for Life $127.99

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

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 organic chemicals like 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 plus healthy minerals retained for purely delicious filtered water.

Pure Performance

Easier 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 Aquasana Claryum® filter gives you 12x the capacity of the leading gravity-based pitcher at only 10¢ per gallon.

Pure Performance

A New, Smarter System

The Aquasana AQ-5200 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 d├ęcor with a designer faucet featuring all metal construction and a 25% increase in flow rate to 0.5 gallons per minute.

How It Works

Superior Filtration

Selective Claryum® Filtration

Reduces 60 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.

  • 500 gallons
  • 6 month filter life
  • 1 year warranty
  • 90 day guarantee

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Read the Reviews

Rated 4 out of 5 by from LOOKS GOOD, HOPE IT EVENTUALLY WORKS CANNOT GIVE A ACCURATE EVALUATION..... ALMOST IMPOSSIBLE TO INSTALL WHEN MISSING TWO RIGHT FINGERS AND THUMB FROM RIGHT HAND... ALMOST IMPOSSIBLE TO NAVIGATE LEFT HAND ONLY, UNDER SINK ... LEAKS ABOUND.... COULD MAKE IT WORK WITH NEW END PIECE THAT FITS HOSE ON DISCHARGE SIDE AND NEW LARGE PLASTIC BLOCK ASSEMBLY.... AS IT IS IT IS NOT SERVICEABLE.... I STILL DON'T HAVE FRESH, CLEAN WATER.... (WOUL
Date published: 2014-11-28
Rated 4 out of 5 by from Worth the time and the money... I have been using Aquasana water filtering systems for about seven years, and I am completely satisfied with their products. Before I bought my first water filter system from Aquasana, I did a lot of research to determine the best company to buy from. I chose Aquasana because their water filtering system extracts the most harmful chemicals and sediments from water. I am a 56-year-old woman with no
Date published: 2014-06-02
Rated 2 out of 5 by from under counter upgrade When I asked why I should upgrade, the two things mentioned were:|-easy installation of replacement cartridges |-improved water flow.||The first is true, the flow is PAINFULLY slow, and I am not happy with this new 'upgrade' for that reason.||I would be interested in knowing the fix for this issue, otherwise I will consider other products from other companies.||We have strong water pressure in the
Date published: 2014-06-25
Rated 2 out of 5 by from Change of kitchen filter system Called on 5-9-2014 when postcard came in mail regarding kitchen upgrade. They said I would be getting a replacement three filter system at no additional charge on 7-19. When system came it is a two filter system.|I also have shower filter and kitchen in line system.|I called today to clarify & I am VERY Disappointed in that now they want to charge me $100.00 for the three filter system.|Bad market
Date published: 2014-08-20
Rated 5 out of 5 by from Improvement on near perfection. I believe Aquasana has the best water filtration products on the market. I have been using them for years. I have also purchased several systems to give to others because I have such high regard for their effectiveness. The water for life program is excellent as is the service by Aquasana employees. Fast service and shipping for all inquiries and orders. I recommend Aquasana to friends and relat
Date published: 2014-05-24
Rated 4 out of 5 by from AQ-5200UPG I think the most important improvement on the AQ-5200UPG from the previous version that I owned is the way the hoses now attach to the unit rather than the filters. Every time I replaced filters on the previous model, if I did not connect hoses properly, I would have leakage into the cabinet under unit. Aquasana sent me a replacement unit but I never installed the replacement filters because I w
Date published: 2014-08-21
Rated 1 out of 5 by from New undercounter filtration system This filter is considerably slower than our previous model. When they offer me this "upgrade" I was told it would be faster. That is the only reason I accepted the upgrade because I was otherwise completely happy with the older model. I have been extremely dissapointed with how slow this filter flows. After many years of being a big aquasana fan and a happy customer I am now completely dissatisf
Date published: 2014-10-26
Rated 4 out of 5 by from Does what is advertised I use this for drinking (4 and 2 leggers) and cooking. When I make iced tea and lemon or limeade it comes from the filter. Anything consumed pretty much! It was easy to install - I was replacing a slightly older under the sink model. There was no mess with the change. The water flow was improved - takes noticeably less time to fill my water container. It certainly is not like water pressure out
Date published: 2014-07-01
Rated 4 out of 5 by from 2 stage under the counter system I'm more or less happy with the system although this would be my third housing since the initial purchase. Even the housing which was just sent is not working properly. There is a constant beeping so I was sent another battery which didn't make anything better. The rep I spoke to told me to just take out the battery and not to worry that the system was still working anyway. Don't know if I lik
Date published: 2015-01-28
Rated 5 out of 5 by from Great Product. Great Value I use my filter for all my drinking and cooking needs. I just upgraded to the new unit that has a warning of when to replace the filter. I think that feature was unnecessary as I always put a strip of tape with the date I installed my filters and when to replace them. Mine was ticking very loud and annoying so I disabled it. It must add cost to the unit and in my opinion totally unnecessary.
Date published: 2015-11-14
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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.

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User Q & A

I have an existing Faucet for aquasana under sink water system. Hoses are all good, etc. need to replace the filter system and filters. The old one cracked and leaked after 10 years. Plumber removed it. I miss it!!  What do I need to buy?  

Asked by: Vista
Hello! Without knowing which filtration system you previously had, I am unsure if our newer systems will be compatible with the faucet. Please contact our service team directly at 866.662.6885 and a representative will pull your account up and let you know what kind of upgrade options we can offer. Thank you, Aquasana Customer Support
Answered by: Aquasana Customer Support
Date published: 2017-07-24
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