The 8 Best Under Sink Water Filters – [2021 Reviews]

Our Editors independently research, test, and rate what we feel are the best products. We use affiliate links and may receive a small commission on purchases.

In trying to stay healthy diet and exercise is critical but the importance of drinking enough water cannot be over stated.

While most of us have access to potable water in our kitchens, the water we receive isn’t exactly perfect. Even the cleanest cities still provide water with contaminants that could only be removed with reverse osmosis at one point in time.

However, now the top under sink water filters can all of that and more. We’ve done the research on you don’t have to. Let’s get started!

Best Under Counter Water Filters

 iSpring RCC7AK Filter SystemFrizzlife Under Counter Water SystemWaterdrop RO Water Filtration System
Reverse Osmosis:Yes, 5 stageNoYes, 4 stage
Throughput:75 Gallons Per Day2.0 Gallons Per Minute400 Gallons Per Day
Tank:2.5 GallonsTanklessTankless

Quick Answer: The 8 Best Rated Under Sink Water Filters

  1. iSpring RCC7AK Under Sink Reverse Osmosis Drinking Water Filter System
  2. Waterdrop RO Reverse Osmosis Water Filtration System
  3. Frizzlife Under Sink Water Filter System
  4. Home Master TMAFC Undersink Reverse Osmosis Water Filter
  5. APEC Reverse Osmosis Drinking Water Filter System
  6. 3M Aqua-Pure Under Sink Water Filter System
  7. Brondell Circle Under Sink Reverse Osmosis System
  8. Express Water Reverse Osmosis Water Filtration System

Our reviews to the top rated under sink water filters with our comparison table and buyers guide will help you choose the right under sink water filter for you.

Under Sink Water Filter Reviews

iSpring RCC7AK 6-Stage Drinking Water Filter System at a Glance:

  • Reverse Osmosis: Yes, 5 stage
  • Throughput: 75 Gallons per Day
  • Tank: 2.5 Gallons
  • Rating: 4.6 / 5.0

First off, we have the iSpring RCC7AK 6-Stage High Capacity Under Sink Reverse Osmosis Drinking Water Filter System.

This system is often considered to be the best under sink water filter out there for an array of reasons. Efficiency combined with a high capacity make it ultra-effective and long-lasting for years of use without issue.

Removing up to an impressive 99% of over 1,000 contaminants, it can remove 98% of lead, and almost all chlorine, fluoride, arsenic, hormones, asbestos, calcium, sodium, bacteria, giardia, viruses and much more.

This will result in clear ice, fresh beverages, and overall a healthier lifestyle. However, the RO membrane not only gets rid of harmful pollutants, but a few minerals which are known to be helpful.

This is why the 5-stage RO system produces slightly acidic water with a pH of 7.0 or less. The 6th stage adds back in these healthy minerals while also alkalinizing the water.

We found installation to be a breeze, relatively speaking, which made our first impression nice. However, the premium quality components only added to that, making sure you have to give the least amount of maintenance possible.

You’ll even find a see-through 1st stage housing so you can easily see if something is hung up or wrong with the filter.

Waterdrop RO Reverse Osmosis Water FIltration System at a Glance:

  • Reverse Osmosis: Yes
  • Throughput: 400 Gallons per Day
  • Tank: n/a
  • Rating: 4.5 / 5.0

Who said that just because they’re placed under the sink, they can’t look good?

The Waterdrop RO Water Filtration System may not see a lot of sunlight, but it’s still very sleek and visually aesthetic, with the all-white design.

Thanks to the no-tank design, secondary pollution is completely eliminated and the slim body leaves more storage space for your things.

Using reverse osmosis technology, it has an impressive filtration accuracy of 0.0001um, removing almost all contaminants in the water.

Coming with 3 filters, you won’t need to purchase any replacements for a while, further saving you money.

It’s also incredibly versatile, being that it can even be hooked up to your refrigerator to deliver pure water and ice straight from the fridge!

Due to an internal pump, this model offers some of the fastest-flowing water you’ll find, at 400 GPD! This makes it perfect for larger families or those that require larger amounts of water.

Despite this, you can save up to 300% of water waste which is not only good for the planet, but for your water bill!

With the convenient installation process, you can expect to spend minimal time setting it up, and no more than a few seconds to change out the filters which is practically unheard of!

Frizzlife Under Sink Water Filter at a Glance:

  • Reverse Osmosis: No
  • Throughput: 2 Gallons per Minute
  • Tank: n/a
  • Rating: 4.5 / 5.0

Ranked as “Amazon’s Choice” as one of the best under counter water filters, the Frizzlife Filter Quick Filtration System is incredibly efficient.

Despite being such a good buy, it’s incredibly budget-friendly as well. If you are on the hunt for quality but want to leave your wallet padded, too, then you can’t go wrong with this one.

Something we really appreciated here was how easy it was to install and how simple changing the filters were.

The twist-in design literally lets you do in in less than 3 minutes – no tools needed! As the filter cap also comes with a built-in shut off valve you don’t have to turn off the water supply if you need to replace the cartridge.

With the capability to remove 99.99% lead as well as other heavy metals, chlorine, chromium 6, mercury, and much more you and your family will be much healthier in this regard.

At full flow, you get an impressive 1.5 GPM production of water which can be used under your sink, on the counter, ice maker, and more!

Overall, if you use a lot of water or have quite a few people in your household, this is an excellent option.

Home Master TMAFC Artesian Full Contact Water Filter System at a Glance:

  • Reverse Osmosis: Yes, 7 stage
  • Throughput: 50 Gallons per Day
  • Tank: 2.5 Gallons
  • Rating: 4.8 / 5.0

Next up, we have the Home Master TMAFC Artesian Undersink Water Filter which is a bit more expensive than the previous one, but still long-lasting and very effective.

We can assure you that the added durability will essentially pay for itself.

Using Reverse Osmosis Technology you can rest knowing that it’s capable of removing up to 98% of chemicals, heavy metals, sediment, and other contaminants.

While it does remove harmful contaminants, it makes sure not to rob you of the ones that do you well.

Restoring natural calcium and magnesium minerals that are taken out during the reverse osmosis stage, you’ll have clean, healthy water always at hand.

Using a modular filter design, you only need to swap out the filters – not the filter housings – when needed. This makes it simple to do, but also ensures the canisters are tough and will effectively trap impurities.

The entire installation process is also very simple and straightforward, with no tools required. Maintenance is just as easy, allowing you to use it carefree essentially, and enjoy the benefits it provides.

Finally, it also comes with a nice 5-year warranty which will have you covered if you’re not completely satisfied or something isn’t working up to your standards.

APEC Top Tier Water Filter System at a Glance:

  • Reverse Osmosis: Yes, 5 stage
  • Throughput: 50 Gallons per Day
  • Tank: 4 Gallons
  • Rating: 4.7 / 5.0

The APEC Top Tier 5-Stage Ultra Safe Water Filter System is consistently ranked as the best under sink water filter system, for countless reasons.

First off, it’s easily one of the most affordable out there at this level of quality. Second, it uses the highest-quality components out there and is engineered and assembled in the US so you are putting your health into safe hands.

To expand on that, it comes with a 100% lead-free designer faucet, along with FDA-certified JG Food grade tubing and parts so you never have to worry about contamination in your water.

Removing up to 99% of contaminants like arsenic, chlorine, lead, fluoride and over 1000 others you will have safe and clean water and ice like never before.

With a system capacity of 50 gallons per day (maximum), it’s a solid option for people who use heavy amounts of water or have larger families.

The noise-free system is sure to last you for many years to come without disrupting anyone.

Installation isn’t necessarily a pain, but it did take a bit longer than the others on our guide to hook up. However, leak-free quick connect fittings do facilitate this a bit.

Finally, a 2-year extended manufacturer warranty keeps you covered long enough to ensure you know it’s made to hold up to regular use.

3M Aqua-Pure Under Sink Water Filter System at a Glance:

  • Reverse Osmosis: No
  • Throughput: 0.6 Gallons per Minute
  • Tank: None
  • Rating: 4.2 / 5.0

If you don’t mind spending a bit more, the 3M Aqua-Pure Under Sink Water Filter System AP-DWS1000 is more than worth it.

Made with high-quality parts, it’s sure to last you for years with minimal maintenance required.

Coming with a polished chrome dedicated drinking water faucet, you’ll receive everything you need for cleaner, healthier water production!

Not only does it reduce particulate, chlorine taste/odor, lead, turbidity, parasitic protozoan cysts, etc. but also features carbon-block filtration.

This process is advanced, ending up with some of the best tasting drinking water you can get.

Installation is super easy thanks to the inclusion of all necessary hardware, along with faucet and pipe connections and a dedicated polished chrome drinking water faucet.

The auto shut-off will also shut the system off after every 625 gallons to ensure you’re regularly changing out your cartridges. With the Sanitary Quick Change (SQC) cartridge design, this is a quick and seamless process as well.

The only thing we really would’ve changed with this model is the fact that all internal parts that come with the faucet assembly are plastic instead of metal.

Brondell Circle Reverse Osmosis System at a Glance:

  • Reverse Osmosis: Yes, 5 stage
  • Throughput: 0.37 Gallons Per Minute
  • Tank: 1.6 Gallons
  • Rating: 4.4 / 5.0

The Brondell Circle Reverse Osmosis Water Filtering System is another incredibly attractive model that you’ll love to show off.

The compact design does make it simple to install under a kitchen sink, however. This makes it easy to save space, but also makes installation a breeze.

If you’re not particularly into DIY projects, you’ll find this installation process one of the less intimidating thanks to the color-coded lines.

Using reverse osmosis technology like many others on our guide, it has an efficiency of 2.1:1 which is quite efficient.

With 4-stage filtration it works with 4 individual advanced water filters which drastically reduces industrial pollutants and harmful chemicals for healthier and tastier water and ice.

The sleek case comes with integrated LED filter change indicators to let you know when to change your filters, which is also very easy to do.

In addition to the filter itself, you’ll also receive a beautiful chrome kitchen faucet which gives you pretty much everything you’ll need.

With a Gold Seal certification by the Water Quality Association you can buy with confidence knowing it’s safe and efficient. Though if you need more convincing, it also comes with a 1-year warranty!

Express Water Water Filtration System at a Glance:

  • Reverse Osmosis: Yes, 5 stage
  • Throughput: 50 Gallons per Day
  • Tank: 3.2 Gallons
  • Rating: 4.7 / 5.0

Last but certainly not least, we have the Express Water Reverse Osmosis Filtration System, which is another excellent selection if you’re looking for a great budget product.

Getting rid of up to 99.99% of lead, chlorine, fluoride and more, you will start feeling better with healthier water the first day you have it.

While it’s admittedly not the easiest to install, it’s more than worth it if you’re looking to save some cash!

Last but certainly not least, we have the Express Water Reverse Osmosis Filtration System, which is another excellent selection if you’re looking for a great budget product.

Getting rid of up to 99.99% of lead, chlorine, fluoride and more, you will start feeling better with healthier water the first day you have it.

The 5-stage filtration system also works to help block sand, dust, dirt, and rust from contaminating your water.

With added Carbon Block and Granular Carbon Filters, they ensure chlorine and volatile organic chemicals stay out of the way, too.

Double-sealed filters help to keep them lasting longer to offer the best value, further saving you money. The Leak Stop Valve is extra handy as it shuts off water flow if it is notified of excess water.

If that weren’t enough, you’ll also receive a nice chrome faucet with a brass water way for pure water delivery each time you use it.

Capable of producing up to 50 gallons of pure water per day, it’s perfect for households that use a lot of water!

Under Sink Water Filter Comparison Table

Under Sink Water Filters Reverse OsmosisThroughputTankRating
iSpring RCC7AK Filter SystemYes, 5 stage75 GPD2.5 Gallons4.6 / 5.0
Waterdrop RO Water Filtration SystemYes400 GPDTankless4.5 / 5.0
Frizzlife Under Counter Water SystemNo2.0 GPMNone4.5 / 5.0
Home Master TMAFC Filter SystemYes, 7 stage50 GPD2.5 Gallons4.8 / 5.0
APEC Drinking Water SystemYes, 5 stage50 GPD4.0 Gallons4.7 / 5.0
3M Aqua-Pure Filter SystemNo0.6 GPMTankless4.2 / 5.0
Brondell Circle Reverse Osmosis SystemYes, 5 stage0.37 GPM1.6 Gallons4.4 / 5.0
Express Water Filtration SystemYes, 5 stage50 GPD3.2 Gallons4.7 / 5.0

How to Choose the Best Under Sink Water Filter – Buying Guide

Best Under Counter Water Filter System
Express Water Reverse Osmosis Water Filtration System

Now that you have had the opportunity to browse through all the under sink water filters, have you decided which one is the best for your household?

If not, then there’s no need to worry. For this exact situation, we’ve decided to take it upon ourselves to create the following comprehensive buying guide.

This guide will take you through each step of the selection process to ensure that by the time you’re finished reading, there will be no doubt which is the perfect machine for you! Get ready to start drinking cleaner, healthier water.

Water Filter vs Reverse Osmosis

You have probably noticed by now that there are some models that use reverse osmosis technology and some that use purely water filters. Both work very well and there’s no “one-size-fits-all”. Rather, it depends on your individual water source and preferences. Let’s take a look at each to see which suits you better.

Water Filter Only

This process typically uses an activated carbon filter which works to catch and remove microorganisms, odor, and other harmful contaminants. These typically rely on pressure to force the water through the filter and retain the healthy minerals while removing those we don’t want. These filters are better at removing/reducing the impurities and contaminants listed below.

However, quality is really important here as they vary widely in performance. They work to remove:

  • Chlorine taste/odor
  • Dirt
  • Sediment
  • Rust
  • Parasites
  • Heavy metals
  • Arsenic
  • Volatile

Reverse Osmosis

If you can afford it and you’re really serious about clean and healthy water, this is honestly the way to go. You’ll often find Volatile Organic Chemicals (VOCs) in the average city’s tap water, such as pesticides, heavy metals, hormones, and more. Using RO technology is capable of reducing these greatly, even up to 99.99% in some cases.

These systems also push water through a carbon cartridge which gets rid of chlorine and sediment. Next up, it’s taken through a thin membrane which removes practically all contaminants. Finally, it will go through another carbon cartridge.

These work to remove:

  • Fluoride
  • Lead
  • Arsenic
  • Nitrite
  • Nitrate
  • Turbidity
  • Cysts
  • Copper
  • Cadmium
  • Selenium
  • Barium
  • Hexavalent Chromium
  • Trivalent Chromium

Water Pressure

When we’re speaking about the under sink water filter systems, water pressure is crucial to having a positive experience. You may not notice it until it starts happening, but low water pressure and having to wait a long time for just a glass to fill up can be irritating.

That’s why you need a filter that can deliver a solid amount of pressure, particularly if you aren’t starting out with good water pressure. In comparison to your “regular” filters, under sink models typically provide improved pressure.

However, the downside of this is that water will often spend less time in the filter. This means that there’s a slightly greater chance of contaminants going through the filter without being caught.

If you’re dealing with a greatly contaminated water source, then this could be an issue. The good news is that that’s typically not the case.

Filtering Capacity

We all want our water filter to work the best, right? However, each model is going to vary a bit. Depending on the components of the filter cartridge, some filters will be more efficient at removing certain types of contaminants than others.

Some models might be particularly skilled at overall filtering capacity, but may be lacking in stopping a specific type of contaminant. If you’re worried about this, then we recommend getting a home water quality testing kit before you decide on a filtering system.

This kit will let you know which contaminants are present at higher levels in your water. Based on these results, you can narrow down your options to those best suited towards what you need to filter out.

Ease of Installation/Changing Out Filters

These aspects are often overlooked by those who’ve never had to install or use an under sink water filter before. While installation typically only needs to be performed once, changing out filters should be simple as you’ll need to do it somewhat regularly.

In regards to installation, you should feel confident and be able to install it without too many issues. What’s really important here is that you install it without damaging the unit. If you’re forcing it or simply doing it incorrectly, this is a very real possibility which we definitely don’t want.

This can lead to unnecessary hassles, along with you having to wait even longer to have clean water. Of course, if you’re not feeling good about doing it yourself, you could always ask someone else for help. While it will cost you, you could also ring up a plumber and have them do it for you.

We do feel like that’s a bit much, though, considering how many great YouTube videos are out there to lead you through each step of the process.

Using easy to change filters is also important. Most of the models we presented use filters that can be changed in under 10 minutes, with some taking less than a minute!

However, some other models on the market use filters that are really difficult to change. This can be a problem, even if you’re only required to change the filters once every 6 months or so.

Cartridge Longevity

You may have noticed this already, but the vast majority of quality cartridges seem to last around 6 months, give or take a bit.

Six months is pretty much the standard, so if you have one that lasts even longer than this, you can feel confident knowing you’ve really received quality. These ones are comprised of higher-standard materials which will also be better at filtering out the “bad stuff”.

However, you should be aware that even though a cartridge might be advertised as holding up for a certain period of time, it might not last that long.

This will vary, depending on the quality of your water source. However, this water is typically tested with municipal quality water. Once this water has traveled through old pipes to reach your home, it may be more contaminated.


This may or may not be of importance to you, but some models can be connected in places other than just under your sink. There are whole house water filters that are installed in your basement or outside your house and filter all the water in your house. However they are expensive to buy and install.

There are some which can be mounted on the counter top and even directly to your refrigerator to provide clean water and ice right from the fridge which is really convenient!

If you’re going to be placing it in an area where it’s seen often, make sure to get one that looks visually aesthetic and ideally goes well with your kitchen decor.


How much are you willing to spend on a good under sink water filter? It’s a good idea to create a budget for yourself before you start looking so you don’t accidentally spend more than you’d wanted to. No matter what your budget is, we can assure you that we have an excellent selection that will fit it.

Just keep in mind that if you do have the means of spending a bit more, it often pays for itself in one way or another. When you go up in price, you’ll find that models are often comprised of higher-quality materials and with more care. They’ll often be more powerful as well.

FAQs About Under Sink Water Filters

Q: Which water filter removes the most contaminants?

A: All of the ones on our guide do an excellent job at removing around 99.99% of contaminants. However, it’s known that carbon filters are particularly effective at removing them, along with less common contaminants that many other filters bypass.

Q: How do I choose a under sink water filter?

A: First, make sure that it can actually fit under your sink! Then, as previously mentioned above, we recommend doing a test of your water to see which contaminants are most present. Make sure that the filter you have in mind will focus on eliminating them, as each one is different.

Q: Is a water filtration system worth it?

A: Yes, especially if you’re using well water or have hard water in your home. These systems will work to get rid of the harmful contaminants while also ensuring that you have the healthy ones added back in. As we’re mainly made up of water, it’s important to have a healthy, clean source. Not only that, but your water will taste better which will encourage you to stay better hydrated.

Q: What happens if you don’t change your water filter?

A: As one may imagine, the filter will just become less and less efficient at filtering out the contaminants in your water. You may even start to notice the odor and taste of your water changing in a negative way.

Q: How often should you change under sink water filter?

It’s highly recommended that you change it out at least every 6 months or so.

Q: Is reverse osmosis water healthy?

A: Yes, it very much is! It works to eliminate lead from water, which can reduce the chance of you or others in your home from conditions like high blood pressure, nerve damage, and low fertility. It’s also crucial in children’s development.

Tips For Choosing Under Sink Water Filters

#1: If you’re looking to save some money, look for a model that already includes a few replacement filters.

While it may not seem like much, it’s nice knowing you don’t have to fork out any more money for your water filter in at least a year.

#2: If you’re going to be using your water filter in public view, pick one that’s visually attractive.

There are some that we’ll admit, are a bit unsightly. These are best to be used under the sink. However, you’ll also find some that are sleek, beautiful, and modern-looking that can typically be mounted on the countertop or even to your fridge.

#3: Make sure you know whether or not the filter in question requires its own separate faucet to deliver clean water.

As you may have noticed, some come with their own chrome faucets. This is more of a personal preference but some may find this way a bit more difficult in the installation process.


Now that you’ve had the chance to read everything you could ever want to know about the best under sink water filters, which one will you be installing in your home? If you’re still unsure know that no matter which one you get, you’ll be receiving one of the best in the world.

However, what’s most important is that you select the perfect product for your home, you, and anyone else living in your house. We hope that our guide has helped you do just that. Thanks for tuning in and we’ll see you again shortly!


The iSpring RCC7AK is our Editor's Choice as the best under sink water filter with its combination of performance, quality and value.

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Ericka Parker

Ericka started her career as a personal trainer over 20 years ago and her goal was to help people become healthy, happy and fit. To do this she would find out their goals and provide the tools and routines to help them reach them. As her career progressed, she added yoga training to her skills to help her clients achieve mindfulness and help with clients mobility. To help more people she started to help other people achieve their fitness goals with advice, tips and fitness equipment reviews.
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