Aquasana AQ 5300: 3-Stage USWF Review

The Aquasana AQ 5300 max flow is a 3 stage under sink water filter system ready to deliver clean water at any time.

Aquasana AQ5300 under sink water filter review - ACW


✅ Filters a broad spectrum of contaminants (77 listed, fluoride and minerals).

✅ Not expensive considering the benefits.

✅ Easy to maintain and filter replacement is easy.

⊖ Filter lasts for 6 months, doing only 600 gallons (2 cubic meters); nevertheless, this filtered volume is still good.

⊖ You will need to arrange your under sink elements to open up space (medium size filtration system).

⊖ It can potentially leak after 2 to 3 years of operation due to the o-rings use.

Not sure yet if this would be the filter for you? Well, check what we think the Aquasana AQ 5300 under counter filtration system is capable of through this review.

Aquasana AQ 5300 Technical Aspects

The AQ5300 has a lot of advantages. Nevertheless, it is important that you check them out before taking a decision on investing your money on a under counter water filtration system:

Main Features
Pollutants Removed
Flow Rate and Water Pressure
Filters (Material and Lifespan)
Water Source
Size / Dimensions
Warranty & Certifications
Main Features

 - Removes up to 99 percent of usual pollutants contained in municipal waters.

 - Treats enough water gallons (6 per day) to supply a big family.

 - Three (3) filters easy to install and remove.

Pollutants Removed

- Heavy metals such as lead, mercury, cadmium and Cr6.
- Herbicides, pesticides, semi-volatile and volatile hydrocarbons, odors, taste.
- Bacteria, asbestos, PFOS and PFOAS.

Flow Rate and Water Pressure

 - 0.5 GPM for the AQ5300. If the filter you have is the AQ5300+, the flow rate is 0.72 GPM.

 - Minimum of 20 psi to maximum 80 psi. This would be the the range for an optimal water pressure. Anything bellow the recommended will result in poor water delivery; above the maximum recommended could damage the filters, creating leaks. 

Filters (Material and Lifespan)

 - 20 microns Pre-filter for rust, dust and particles that can clog the next filters.

 - Activated carbon for taste, organic and inorganic compounds.

 - 0.5 sub-micro Catalytic Carbon with Ion exchange for smaller particles such as bacteria asbestos and heavy metals.

 - Lifespan is six (6) months for all filters (600 gallons). This could be variable depending on the usage.

Water Source

 - Only Municipal water (chlorinated). Do not filter any water that you are not sure about; this means, anything that could potentially be micro-biologically unsafe or from an unknown source.

Size / Dimensions

 - 12 x 4.2 x 9 inches.

 - Medium size filtration system.

Warranty & Certifications

 - The warranty is for one (1) year. Check with the manufacturer for a lifetime filter warranty.

 - Certifications: NSF/ANSI 42 (chlorine, taste, particles); 53 (VOC, asbestos, cists), 401 (herbicides, pesticides, pharmaceuticals) and P473 (PFOS and PFOAs).


The Aquasana 3 stage max flow under sink water filter system has been built to filter your water through three (3) different mediums and remove various contaminants.

The Max Flow is rated for 600 gallons of total filtration, and provides 44% more water flow than standard filters. It can be placed in a custom mount, or simply mounted in a soap hole on a compatible countertop.

What to Consider before Buying the Aquasana AQ 5300 3 Stage Water Filter

Filters and Pollutants Removed

AQ 5300 filters - ACWThis Aquasana under sink water filter integrates three (3) different filtration stages to maximize the pollutants reduction process. This includes:

  • Pre-Filter.
  • Activated Carbon.
  • Catalytic Carbon (Ion Exchange).

The filtration process is as follow:

  1. The first filtration stage is the pre-filter; this is the most important stage as it will remove any dust, rust or particle that can clog the next filters.
  2. Pharmaceutical residues, herbicides, PFOS and PFOAS (a contaminant that is present in fire fighting foams), pesticides, semi-volatile and volatile organic compound and MTBE are removed over the second stage, where the Activated Carbon Filter is located.
  3. Finally, the Aquasana 3 stage Max Flow has a 0.5 sub-micron filter for tiny particles like asbestos or bacteria that may sneak through the chemical filters; it also includes an ion-exchange process that removes heavy metals like lead and mercury.

Operation & Maintenance

Maintenance is also easy. The filter covers screw off and on, and the filters themselves slide on. Changing these filters only takes a couple minutes.

Keep in mind that you will need to ensure a minimum water pressure of 20 PSI and maximum of 80 PSI; this will translate into a flow rate of 0.5 gallons per minute.

A pressure over 80 psi will make your system to leak.

Based on the manufacturer specifications, the filters can last up to six (6) months with a filter capacity of 600 gallons. This time frame will also depend on how much you use the system and the level of “contamination” of your water.

Lastly, check with the supplier (Aquasana preferably) about a possible lifetime warranty over the filters. They have a subscription program where you can receive filters and o-rings overtime (we think, this could be a good think considering that the o-rings could be a problem in the future).

Aquasana AQ 5300+: An Upgraded USWF version

Aquasana AQ 5300+ 3-Stage Max Flow Under sink water filter reviewAquasana has taken the next step and launched the Aquasana AQ5300+. The main changes for the latest under sink water filter is:

  • 800 gallons filtering capacity.
  • 0.72 gallons per minute flow rate and,
  • Comes with Bluetooth connectivity.

There’s also a smartphone app that alerts you when the filters need changing, which is a nice touch.

…..the downside:

Even though, the Bluetooth feature is a great advantage, it is not as great as expected. This connectivity system is capable of telling when the filters need changing only if you indicate the location of the filter and the date and time you installed them all; this means that the app will calculate the lifespan of the filters only by knowing the date and time of installation.

Aquasana AQ 5300: Final Thoughts

The AQ5300 max flow is an under sink water filter created to clean your potentiality contaminated tap water.

With a 0.5 gallons per minute flow rate and a 600 gallons capacity, the filtration system will ensure that you will have clean water anytime you require it.

Three (3) filter are fitted with this system. Pre-filter, Activated & catalytic carbon filters with ion exchange and micro filtration will remove up to 99% of most common contaminants present in municipal waters, however, this does not mean that every water is the same.

Waters that are microbiological unsafe or with no clear quality are not recommended to be filtered with this filtration system.

Finally, the Aquasana AQ 5300 could be the answer you are looking for if you count with enough under sink space in you kitchen and need to filter enough water for a big family. If that is not the case, well you can always look into smaller water filter technologies like gravity fed water filters (such as Berkey or Alexa Pro water filter).

Other readers will appreciate what you think about this 3 stage water filter:


Pollutants Removed


Flow Rate


Water Pressure


FIlters Lifespan


Size / Dimensions


Operation & Maintenance


2 thoughts on “Aquasana AQ 5300: 3-Stage USWF Review

  • January 3, 2020 at 3:00 am

    Want is size of flange for faucet base. I have a 1- 1/4 ” hole in my sink. Will it cover this opening. Also is there a storage tank? Can it run without a limited supply? This is for aquasana aq-5300.

    • January 6, 2020 at 9:33 pm

      Hi Leo,

      The included flange should be around 3.5 cm diameter. Generally speaking, the faucet was designed to fit any sink base so if you haven’t modified yours, I would say it should be okay. If for any reason this is not the case, you can always go to your local plumbing shop and get a slightly bigger diameter.

      As regards to the tank, this under sink water filter does not include that feature. If you are after a water filtration system with those characteristics, I suggest you read our RO Guide and find the APEC Top Tier 5-Stage Ultra Safe RO (Essence ROES-50) review.

      Lastly, the Aquasana AQ-5300 can operate without limitation but the filter’s lifespan is the trigger.



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