TOP 4 Under Sink Water Filters: 2024 Reviews & Best Choice

All of the concerns about contaminants in the water we drink and cook with prompted me to take a look at what’s available for homeowners and small offices.

What I found was not only surprising, it was gratifying. I say gratifying because it’s nice to know there are some great Reverse Osmosis water filter products that can fit under the sink.

Some water filtration designs require installation somewhere other than under the sink, which adds significantly to the bother factor and the cost in many cases.

4 Best Under Sink Water Filters

What Is the Best Under Sink Water Filtration System?

To qualify for the list, I wanted to make sure the different filtration systems had some common denominators.

Many buyers have never purchased an under sink water filter product before and I wanted to point out the main features to look for in any water filtration product.

Those common features include:

  • Sufficient storage capacity
  • Easy to install
  • Easy to change out filters
  • Long-life filters
  • Superior technology
  • Improves taste with pH balancing and alkaline infusion

Reverse Osmosis Filters Work Best

As far as I am concerned, Reverse Osmosis water filters work best because they not only filter out all the undesirable elements but also add pH-balancing components and alkaline that help make the water taste better.

For many of my readers, the water they start with is from old municipal water lines or wells.

In either case, enhancing the taste of the water while clearing out the contaminants is essential.

When contaminants aren’t a real problem, the straight filtration design that eliminates a water storage tank works for many consumers.

Under Sink Water Filter Reviews

FW-210 4-stage Under Sink Reverse Osmosis System

Best Reverse Osmosis
FW-210 4-stage Under Sink Reverse Osmosis System
  • Connects easily to cold water line for unlimited filtered drinking water
  • Easy access to filters for service
  • Designer , lead free faucet in chrome or brushed nickel
  • Leak detection valve is included
  • No hassle, no tools required, easily replaceable filters connected via quick connect fittings.

The reasons I put the FW-210 product number one on the list are simple:

  • This is a system that is easy to install
  • Has 4 filter stages
  • The filters last a long time

The folks at FilterWater thought this one through completely.

Highly Efficient At a Fraction of the Price

For a homeowner or a small office, this design works like much more expensive products with all the same features.

Appealing Look

One aspect of the design I appreciate is the look.

It doesn’t look like your average run-of-the-mill water filter.


When it comes to mounting a product in a confined space under the sink, this filter can be a real lifesaver.

Other Notable Features

Another feature I like about this filter is the high flow rate and daily capacity (up to 180 gallons) is a good amount as well.

The faucet included in the installation kit has a chrome exterior and all the tools and pieces needed for the installation.

  • NSF Certified
  • 4 stage filter
  • Filters 99.99% of contaminants
  • Long-life filters
  • Leak detection valve included
  • Expensive replacement filters

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Crystal Quest CQE-US-00324 8-stage Triple Nitrate Under Sink Water Filter

Best 8-Stage
Crystal Quest CQE-US-00324 8-stage Triple Nitrate Under Sink Water Filter
  • 3 cartridge, 8 Stage filtration process
  • One Nitrate cartridge, large filter dedicated to Nitrates removal
  • Carbon Block filter to fight volatile organic chemicals(VOCs) and other contaminants
  • Combined with advanced Coconut Shell Carbon(GAC) and KDF(Eagle Redox Alloy) media technology
  • Filter media combination removes hundreds of other contaminants

The Crystal Quest CQE-US-00324 made it onto my list because it’s as simple a design as there is.

Super Easy to Install

This is an under-sink system that will fit in 99% of all applications because it’s highly compact.

That’s a cool thing because it means easy installation and more room left over under the sink for other important stuff.

No Waste Water

This is not a Reverse Osmosis product, rather, water flows through the filters before exiting to the faucet. That means no post-filtration waste water like many other filtration products.

For areas where water toxicity is not a problem, this is a great way to get purified water without having to wait for a storage tank to fill or refill.

The Filters Are Just as Easy to Replace as the Installation Itself

One thing reviewers rave about this system is the ease with which the filters are switched out. Twist-on, twist-off filter packs with color-coded ports make this unit easy enough for a third-grader to install.

I agree that when it comes to simple, effective water filtration, this is a great system for homes or small offices.

  • 8 stage filter
  • Filters 99% of contaminants
  • Long-life filters
  • Perfect for filtering nitrate
  • No refrigerator water line

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Crystal Quest Mega 2000 7-stage Dual Under Sink Water Filter

Best 7-Stage
Crystal Quest Mega 2000 7-stage Dual Under Sink Water Filter
  • 7 Stages of filtration
  • Installs neatly under the sink
  • Comes with an attractive faucet and all necessary installation hardware
  • Conveniently provides years of filtered water(depending on configuration)
  • Combination of Solid Carbon, Granulated Activated Carbon(Coconut Shell), and Eagle Redox Alloy

Another Crystal Quest product is on my list because it is just as good at filtering water while being smaller than its larger sibling mentioned above.


Because it has only 2 cartridges it’s perfect for places where every square inch of space counts.

For many homeowners and office managers, space is at a premium.

The beauty of this product is that it can be installed in very tight spaces and still offer high levels of filtration.

Set It and Forget It

The filters have a large lifespan.

The basic model (CQE-US-00306 – PLUS) has a filter life of up to 3 years, while the advanced one (CQE-US-00308 – ULTIMATE) has up to 5 years. Now that’s long.

  • 7 stage filtration
  • BPA free
  • Excellent filter life
  • Great tasting water
  • NSF certifies
  • Fridge connection fittings need to be purchased separately

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Crystal Quest Mega 1000 6-stage Single Under Sink Water Filter

Best 6-Stage
Crystal Quest Mega 1000 6-stage Single Under Sink Water Filter
  • 6 Stages of filtration
  • Installs neatly under the sink, installation hardware is included
  • Comes with an attractive stainless steel faucet
  • Conveniently provides years of filtered water (depending on configuration)
  • Available with one or both valves to connect to most common lines: T-valve, Saddle Valve, or both

The Crystal Quest Mega 1000 is a great little filtration product using some terrific technology to get the job done.

Don’t Let the Small Size Fool You

This is a smaller filtration system using only one filter pack.

That is amazing by itself, but what really makes a difference is the advanced filtration technology Crystal Quest employs in its product.

This is the smallest of all the filtration products I am recommending. The 6-stage filter system has the smallest footprint of any filtration product.

If you’ve got a very limited amount of space under the sink, this is the product for you.

The basic model of this system can still filter 10.000 gallons of water before the filters have to be replaced. That’s a lot of pure water for very little cost.

Patented Own Filtration Technology

It uses Crystal Quest’s patented Eagle Redox Alloy® antimicrobials to eliminate viruses, bacteria, protozoa, and other living harmful organisms.

Doesn’t Remove Nutrients

What I like about this filtration product is that it removes the chemicals and contaminants that you don’t want in your water while leaving the minerals you do want.

Many Reverse Osmosis systems filter out the good stuff along with the bad, but this system leaves the good stuff where it belongs.

This little package packs quite a big punch!

  • 6 stage filter
  • NSF Certified
  • Filters 99% of contaminants
  • Long-life filters
  • Smallest under sink filtration product available
  • Zero wastewater
  • Fridge connection fittings need to be purchased separately

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Which Under Sink Water Filter Is The Best For You?

The decision about which water filtration system to buy depends on a few different key factors.

Location, Location, Location

water quality us map

First of all, where you live and the kind of water you get will be a big part of the decision.

Areas with toxic water will require sophisticated filtration processes to remove chemicals, minerals, and bacteria. Water wells have their issues as well as water from municipal systems that add chemicals like fluoride and chlorine.

Testing water before purchasing a water filtration product makes sense so that you know what you need to get rid of as well as determining how good the filtration system is once it has been installed.

If you’re not a dedicated DIY kind of homeowner, it’s a good idea to have a professional plumber install the filter.

Size Matters

crammed under sink cabinet

Caution should be exercised before purchasing to eliminate problems with installation.

Water storage tanks take up a lot of space and attention should be given to the inner dimensions of the sink cabinet.

Some kitchen sinks are deeper than others and that affects the area available to install an undersink filter system.

Water Pressure is also important for every system, so be sure to understand how much water pressure you’re working with before installing a product.

Don’t forget to measure distances to water taps, refrigerator receptacles, and ice-making machines.

Time spent preparing for purchasing your water filter system will result in a much easier, less antagonizing, and more successful installation.

Tips and Tricks on Cleaning

How Do You Clean An Under Sink Water Filter?

The process of cleaning under counter water filters is simple and straightforward.

The only real problem you might encounter is tight space. If it’s really crammed up, then it’s better to remove the entire thing and do the cleaning somewhere where you’ll feel more comfortable (like on a workbench).

It makes sense to clean the filter only when the performance drops (water pressure drops, discolored water, etc.). This is because the process is sometimes time-consuming given the small cabinet space most homes and offices have.

Before getting started, make sure you’re wearing gloves.

putting on gloves

Let’s get started:

1. Gather Tools and Other Needed Supplies

Prepare your filter housing wrench, towels, and a bucket to capture water dripping from the system.

Speaking from experience, I also suggest having a flashlight, flathead screwdriver, a utility knife, and some spare O-rings.

If you want to be even more pedantic, use a pressure gauge or a bike pump to check and adjust the tank pressure.

2. Turn off the Water Line

Shut off all the valves and the inlet water hose.

If you have an electric UV light or any other electrical wires connected to the filter, disconnect them as well.

3. Drain the Water From the Filter

Open the faucet and let it run for about 10 minutes to drain the system in full.

Doing this also releases the pressure.

4. Open the Housings

Open them in an upright position as there can be some water remaining inside.

5. Check and Clean the Cartridges

Check them thoroughly and clean them using dish soap, vinegar, or bleach and water (how to clean them in detail, read the instructions below).

Once cleaned, dry them (preferably in the sun).

Do the same thing for the O-rings.

6. Reassemble

Once dry, place the cartridges and the O-rings back in their housings, tighten the housings, and reconnect all the hoses and wires.

6. Test the System

Open the faucet for about 10 minutes to get rid of any air in the system and to flush out any particles that may have been knocked loose or that will come off the fresh filters.

After that, check for leaks one more time. 

Can You Clean A Water Filter With Vinegar?

If you don’t have chemical cleaners suggested by your manufacturer, you can use vinegar and water.

It’s a very effective solution that can not only clean the filter but also removes limescale.

Espresso lovers use them all the time to descale their espresso machines.

espresso machine vinegar

How to clean a filter depends on the type.

Reverse osmosis (RO) membranes have a different cleaning procedure than activated carbon/charcoal filters. The same goes for other types.

How to clean a reverse osmosis membrane and activated carbon/charcoal filter, click here. (NOTE: for RO in step 3, replace the cleaning solution with equal parts white distilled vinegar and warm water. For charcoal filter cleaning, add 4 cups of vinegar instead of acid).

Can Filters Be Cleaned And Reused?

In most cases, yes.

If you don’t see mold forming or physical deformations (like tears for example), you can just clean the filter and reuse it.

Replacement filters cost a lot, especially if you have to replace them often.

On the one hand, water filter manufacturers want us to drink safe water but on the other hand, they want to sell us more stuff so they can profit more.

Personally, I should replace my filters every year but instead, I clean them thoroughly every 6 months.

Get Clean, Get Healthy, And Get Happy!

All the talk about having a cleaner and healthier environment starts at home.

Plastic water bottles fowl our streets, parks, offices, and lives.

The world doesn’t need more garbage but it can certainly use more clean water.

Having a water filter at home or the office helps keep the environment cleaner as well as your body.

Plastic bottles degrade over time and sometimes that degraded material ends up in the water they hold.

Better tasting water and food along with clear ice and healthier plants are a few more benefits of getting rid of bottled water.

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About Mario 148 Articles
I am the owner of Kitchen Guru Ideas. I've set up this site so I can share my kitchen tips and hacks that have been passed on to me from my parents and grandparents and show you how a wonderful experience cooking is and not just a way to save money. Even in this hectic lifestyle, there is time to prepare and most important enjoy a home-cooked meal.

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