Reviewed: NU Aqua 3-Stage Whole House Water Filtration System

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In this review, we’ll take a look at the NU Aqua 3 Stage Whole House Water Filtration System. It’s a 20″ x 4.5″ cartridge unit a.k.a. big blue which delivers filtered, refreshing water throughout your entire house, from your kitchen sink to your shower(s). Above that, it’ll protect your appliances from sediment, extending their life.

But what we like most is the price. Sure, whole house water filters that work with multiple cartridges instead of one large media tank are always more affordable upfront. And yet the Nu Aqua 3 Stage is surprisingly cheap when you consider all the extras it comes with. Are you hooked? There’s more!

NU Aqua 3 Stage Whole House Water Filter

NU Aqua 3-Stage Whole House Water Filter

Filter Capacity:100,000 Gallons or 6 Months
Water Flow Rate:15 gpm
Annual Cost:~$150
Warranty:3 Years

Our Rating

NU Aqua 3-Stage Whole House Water Filter – Key Features

First of all, what exactly does the NU Aqua whole house water filter do?

Plumbed into your home’s main water line, it features 3 filter stages:

  • At stage 1, the incoming water runs through a sediment filter (polypropylene fiber) which traps floating particulates down to 5 microns in size, so dirt, sand, rust, dust and debris. This does 2 things: A) it stops those sediments from damaging your dishwasher, washing machine, and so on. And B) it prevents premature clogging of the granular activated carbon filter in stage 2. Speaking of…
  • Stage 2: A GAC (granular activated carbon) water filter reduces chlorine, pesticides, herbicides, lead, color, bad tastes, odors, and dozens or even hundreds of other chemical and organic contaminants, depending on the quality of your water. These substances can often have a negative impact on your health.
  • Stage 3: Stage 3 uses more carbon, but this time in the form of a carbon block filter (5-micron nominal) which also helps with giardia and cryptosporidium among other stuff. Lastly, it gives your water a polishing touch.

All in all, the NU Aqua 3 Stage Whole House Water Filtration System is ideal for tap water treatment – tap water containing chlorine. It’s less effective against chloramine, and if you’re on well water you’ll likely require a different approach, too.

That said, you’ll get great-tasting water to drink and cook with. On top of that, you can enjoy chlorine-free showers for less irritated skin.

Water flow rate? 15 gallons per minute which is perfect for small to large homes.

NU Aqua Pros

More pros:

  • Built-in pressure gauges allow you to easily monitor each of the 3 filter stages. As soon as the pressure difference before and after a stage gets too high, it’s time to replace the filter cartridge inside.
  • Pressure release buttons at every stage make filter changes a piece of cake.
  • System installation is intuitive and “straight to the point“. Ideal for DIYers to save money!
  • The stainless steel frame brings stability and allows wall mounting or free standing.
  • You get a 180-day 100% money-back satisfaction guarantee.
  • The system is warranted for 3 years by the manufacturer.

NU Aqua 3-Stage

The NU Aqua – learn more on


Are you handy with tools? If so chances are you’ll be able to install the Nu Aqua whole house filter yourself. Reviewers said the included instructions are easy to follow.

Also, the system is shipped preassembled and already mounted in its stand.

One drawback: There’s no built-in bypass so you have to create one manually if you want one.

The Package (Parts)

  • Filter module
  • 1x 5-micron polypropylene sediment filter cartridge
  • 1x granular activated carbon water filter cartridge
  • 1x 5-micron nominal carbon block filter cartridge
  • Housing wrench
  • Stainless steel frame with mounting bracket
  • Installation instructions


Changing one or more of the filters is as simple as removing the housing, taking out the old cartridge, and inserting a new. Now you can put the housing back on and carefully tighten with the wrench.

If a housing is stuck you can use the button on top to release any pressure. This makes the whole process so much more convenient.

How long will each filter last? It depends on your water quality, but somewhere around 100,000 gallons or 6 months should be realistic. If you’re not sure about when to change, check the pressure gauges. The pressure drop before vs. after each filter stage should be small. If the difference becomes too big it’s probably time for a replacement.

By the way, NU Aqua replacement filters are highly affordable. Annual cost: About $150. Still, because everything is standard-sized you can opt for even cheaper off-brand models if you want.


We couldn’t find a link to the manual. Sorry!

NU Aqua Cons

From 2 customer ratings we learned that there might be a problem with the GAC filter causing low water pressure. The only solution was to buy a replacement.

And there’s no built-in bypass.

NU Aqua Review: Our Verdict

People reported they saw a drastic improvement in their water quality after installing the Nu Aqua whole house filter: Free from chlorine smell and an amazing taste overall from every outlet. All things considered, this is our go-to whole house cartridge water filter for municipal water with basic filtration needs. 4.5 stars!

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This completes our review of the NU Aqua 3-stage whole house water filter. If you have any questions please don’t hesitate to leave a comment below!

About the Author Gene Fitzgerald

Gene Fitzgerald has been with BOS since the very beginning. She is head of content creation and has fully immersed herself into the home water treatment industry only to become an expert herself. Outside of BOS, Gene loves reading books on philosophy & social issues, making music, and hiking.
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