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The 5 Best Under Sink Water Filters – [2020 Reviews]

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If you want to treat and purify the water that your family drinks, then you’ll need a under sink water filter. These get rid of all contaminants that may be in the water, so you never have to worry if it’s safe to drink.

However, you should know that these models vary widely in terms of quality, price, and features. That’s why we’ve taken it upon ourselves to do the research, and bring you the top-rated under sink water filters currently available today.

Best Under Sink Water Filters

HydroPerfection Undersink Reverse Osmosis Water FilteriSpring UnderSink Reverse Osmosis SystemFrizzlife Under Sink Water Filter System
Dimensions:16” x 8” x 5”19” x 15” x 5”9” x 5.5” x 5”
Adds Minerals:YesYesNo

Quick Answer: The 5 Best-Rated Undersink Water Filters 2019

  1. HydroPerfection Undersink Reverse Osmosis Water Filter
  2. iSpring RCC1UP-AK UnderSink Reverse Osmosis System
  3. Frizzlife Under Sink Water Filter System
  4. APEC Water Systems RO-90 Reverse Osmosis Water Filter
  5. Watts WP500313 Undercounter Drinking Water System

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

Under Sink Water Filter Reviews

#1 HydroPerfection Undersink Reverse Osmosis Water Filter

Currently one of the best reverse osmosis system for under sink use out there, the Home Master TMHP HydroPerfection is perfect if you want your water just about the cleanest it can be.

Coming with a whopping 9 stages, you get various filters and a UV light to purify each gallon produced. Speaking of which, thanks to the included permeate pump, you can get up to 75 gallons per day while helping to reduce waste and boost efficiency.

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One of the easier models to clean, you’ll find it has a modular filter design so you can quickly change each element out.

Each filter has its own housing, so you don’t have to mess with the others to change it. Taking just a couple of minutes, all you have to do is remove the old, and put the new one in.

Not only is it easier to use, but this also extends the life of the filters making the Home Master a good choice as the best under sink water filter for well water. On average, you’ll find each filter lasts about a year.

Removing up to 98% of iron, chemicals, heavy metals, sediment, and other contaminants, they have added in calcium and magnesium twice to ensure your water tastes good while making sure you’re healthy.

Don’t worry about installation either – even if you have the most basic of DIY skills, this should be a breeze for you.


HydroPerfection Undersink Reverse Osmosis Water Filter at a Glance:

  • Filtration Stages: 9
  • Dimensions: 16” x 8” x 5”
  • Weight: 18.75 pounds
  • Purification: Filter/UV
  • Adds Minerals: Yes

#2 iSpring RCC1UP-AK UnderSink Reverse Osmosis System

If you don’t mind the extra size and weight, the iSpring RCC1UP-AK 100 GPD Reverse Osmosis Water Filtration System is an incredible unit.

You can store it just about wherever you’d like, though under the sink is a convenient way to stow it to where it’s not visible. The 7-stage system is still quite impressive, even if it’s not the 9 that the HydroPerfection has.

So, what does the 7th stage do?

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It uses a UV filter to create an antibacterial process, ensuring no bacteria can survive. That’s some high-tech stuff that makes a huge difference in the quality of water you and your family will be using.

In addition, you get various filtration components, with a thin-film calcium carbonate to remove particles all the way to just 0.0001 microns!

Being one of the best under sink water filters, installation is pretty simple like the others on our list. Just make sure that you aren’t keeping it where it could receive sunlight, as this can spark algae to grow.

While they do include a booster pump to keep pressure constant (which can be an issue with reverse osmosis systems), know that they aren’t loud like the majority of pumps are.


iSpring RCC1UP-AK UnderSink Reverse Osmosis System:

  • Filtration Stages: 7
  • Dimensions: 19” x 14.5” x 5.25”
  • Weight: 36 pounds
  • Purification: Filter/UV
  • Adds Minerals: Yes

#3 Frizzlife Under Sink Water Filter System

While the more complex reverse osmosis systems are certainly effective, they are also more expensive and take up more room.

Whether you’re looking for something more compact, or something more affordable, the Frizzlife is the best water filtration system can help you out.

The two-stage filtration system is quite basic, but it gets the job done, removing over 99.99% of contaminants, including lead, chlorine, chromium 6, mercury, rust, carcinogens, and more.

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In addition, it eliminates foul odors, turbidity, and unpleasant tastes. While this system doesn’t add them in, it does make sure to leave any calcium, potassium, magnesium, and other essential minerals that already exist in the water.

Installation is extremely simple, and shouldn’t take you more than an hour. It’s compatible with both ½” and 3/8” cold water lines and actually comes with your standard 3/8” direct connect hoses.

Just as well, the model features straightforward twist-in installation and an auto shut-off design which means changing a filter is fast (around 3 minutes), too. As each filter lasts, on average, two years, you won’t have to do this very frequently, though.

For delicious-tasting drinking water on a budget, it’s hard to find one that comes close to the Frizzlife!


Frizzlife Under Sink Water Filter System at a Glance:

  • Filtration Stages: 2
  • Dimensions: 9” x 5.5” x 5.4”
  • Weight: 4.2 pounds
  • Purification: Filter
  • Adds Minerals: No

#4 APEC Water Systems RO-90 Ultimate Reverse Osmosis Water Filter

APEC Water Systems RO-90 Ultimate Reverse Osmosis Water Filter

The RO-90 from APEC Water Systems is another 7-step reverse osmosis filter system, that we couldn’t leave off of our list. If you want to enjoy fresh, healthy, delicious water right from your kitchen without having to purchase bottled water, make sure to keep on reading.

The premium-grade system is certified with a WQA Gold Seal, meaning it has one of the highest contaminant removal rates on the market.

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In this filter you’ll find: a sediment filter, a carbon block filter, another carbon block, and after going into a holding tank, goes through one last carbon filter to remove any possible unwanted tastes.

The complex system gets rid on harmful minerals and chemicals, volatile organic compounds, sediment, bacteria, fluoride, and more.

Coming with a 100% lead-free chrome faucet, you have literally everything you need for fresh drinking water right from your kitchen sink.

In addition, you’ll receive a 5-foot-long, FDA-approved tube, feed adapters, 4-gallon pressurized tank, and all proper fittings and hardware needed to set it up.

Quite possibly the only complaint we had was that the waste/use ratio is quite bad. For every gallon of filtered water, 3 go down the drain, which is a not a good rate. However if you are look for the best under counter water filter, look no further!


APEC RO-90 Ultimate Reverse Osmosis Drinking Water System at a Glance:

  • Filtration Stages: 5
  • Dimensions: 16” x 5.2” x 17.5”
  • Weight: 25 pounds
  • Purification: Filter
  • Adds Minerals: No

#5 Watts WP500313 Undercounter Drinking Water System

Very similar to the Reverse Osmosis Revolution, the Watts WP500313 is another 3-stage filtration system to convert your home’s water into a clean, refreshing beverage.

One of the filters is a 5-micron sediment filter, while the next is a 1-micron carbon block filter to eliminate lead, chemicals, and parasitic cysts. On top of that, you’ll find that volatile organic chemicals (VOCs) are also removed to keep your household safe.

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Filtering up to 600 gallons, it’s not necessarily made for heavy usage, but it might be the best sink water filter thats perfect for light water consumption.

Aside from making water healthier for drinking, it also reduces the taste of chlorine taste and smell.

Installation is definitely one of the easiest and quickest processes with this model, and changing the filter is just as easy.

If you’re unsure about what water filter to get and don’t want to commit to a larger investment, give this water purifier a go!


Watts WP500313 Undercounter Drinking Water System at a Glance:

  • Filtration Stages: 2
  • Dimensions: 14” x 7” x 16”
  • Weight: 9 pounds
  • Purification: Filter
  • Adds Minerals: No

Under Sink Water Filter Comparison Table

Water Filter SystemStagesSizePurification MethodAdds MineralsRating
HydroPerfection Undersink Filter System916”x8”x5”Filter/UVYes4.7 / 5.0
iSpring UnderSink System719”x 5”x ”Filter/UVYes4.5 / 5.0
Frizzlife Under Sink Water Filter System29”x5.5”x5”FilterNo4.7 / 5.0
APEC Water Systems RO-90516”x5”x17”FilterNo4.6 / 5.0
Watts Undercounter System214”x7”x16”FilterNo4.2 / 5.0

How to Choose the Best Undersink Water Filter – Buying Guide

best sink water filter
Home Master TMHP HydroPerfection Undersink Reverse Osmosis Water Filter System

If you’ve noticed some unpleasant tastes and odors coming from your home’s water system, or just want to make it even healthier for consumption, you’ll want a good under sink water filter. However, selecting the perfect one for your needs may be hard to do, so we’ve gone ahead and created the user-friendly buying guide below.


As you can see by the array of products above, filters vary quite a bit. Some models only have 2, while others have 9!

What we recommend first of all, is testing your water to find out which contaminants are present in the water.

That way you’ll know what kinds of filters you’ll need. For example, if you have a lot of metals contaminating it, look for one with a copper-zinc mineral filter.

More serious, would be if you have bacterial contamination, where you’d need something more high-tech such as a UV filter.

best under sink water filter
Watts WP500313 2 Stage vs Home Master TMHP 9 Stage Water Filter

Filter Size / Microns

The filters inside the models above also vary quite a bit in terms of the micron size that they filter out. The cheaper models are going to filter out anything that’s 5 microns and larger, while the best can catch those measuring 0.0001 microns which is incredibly small. Ideally, you’ll want something that filters out impurities with sizes of up to 0.35 microns.

Filter Life

Replacement of a cartridge/filter isn’t always an easy process, depending on the product in question. While they’re not as difficult as installation, you still don’t want it to be a hassle or you may tend to wait longer than you should to replace them.

Keep in mind that changing the filters are going to be something you’ll have to do regularly. However, this frequency will depend on how much water you use, and how many gallons it will last. Most will hold up to around 100,000 gallons before needing to be replaced, while others can go up to around 1,000,000!

If you don’t use much water, you could end up with filters that last for 5 years whereas regular usage could have you replacing yours in under a year.


This isn’t by any means a necessity, but if you have either a National Sanitation Foundation (NSF) or Water Quality Association (WQA) certification on your unit, you can rest easy knowing that it’s gone through strict testing through some of the most qualified organizations throughout the country.

Remember that if it doesn’t have a cert, that doesn’t mean it’s of poor quality. It actually costs a pretty penny to get these certifications, and many companies can’t or don’t want to put that money out.

Ease of Installation

While most of the products on our guide as relatively easy to install, they still differ a bit. Some can take under 20 minutes to set up, given you already have a bit of DIY skills in your back pocket. Others can take up to and over an hour, in contrast.

Of course, you could always get a handyman or plumber to do this, but you’ll probably have to shell out extra cash for that.

Home Master TMHP HydroPerfection Undersink Reverse Osmosis Water Filter System


How much are you willing to spend on one of the best whole house water filters? It’s a good idea to have a solid number in mind before you start looking so you don’t risk going over the budget you’ve set for yourself. Filters are a great example of “you get what you pay for”.

When the price goes up, you can also expect an increase in durability, in efficiency, and they will also typically remove smaller materials as well as different materials like bacteria through means of UV lights.

FAQs About Under Sink Water Filters

Q: Which water filter removes the most contaminants?

A: This answer comes down to the HydroPerfection Undersink Reverse Osmosis Filter, and the iSpring RCC1UP-AK 100 GPD. They both use a great amount of filters, along with UV lights to get rid of bacteria, sediment, unwanted minerals, chemicals, and much more.

Q: How much does a under sink water filter cost?

A: As you can see above, they can be as inexpensive as $70 more or less, all the way up to around $700. However, there are much more complex options on the market which require professionals to set up, that can cost thousands.

Q: Which under sink water filter is best?

A: That will depend on your individual needs. You’ll have to do a water test to figure out which materials need to be removed from your water, then figure out the budget you have for it. Overall, though, we’d highly recommend the iSpring, which has 7 filters and removes insanely small particles.

Q: How often should I change my under sink water filter?

A: If you don’t use a lot of water, we recommend changing them every 3-6 months. If you use higher amounts of water, then 6 to 12 months is the standard.

Q: Can you filter lead out of water?

A: Yes, you can if you have the right filter. Reverse osmosis filters are considered to be the best device for doing so, as they generally include activated carbon filters capable of getting rid of lead in water.

Q: Why use reverse osmosis filters?

A: They are powerful devices which can get rid of up to 99.99% of water contaminants including:

  • Bacteria, algae, fungi, and other organisms
  • Lead, iron, arsenic, mercury, and other harmful metals
  • Foul odor and taste
  • Salts, dirt, sand, and other sediments

…and much more.

Tips For Using Your Reverse Osmosis Water Filter

#1: Know the flow rate of your dispensers and appliances.

The flow rate is going to be measured in gallons per minute, which is the amount of water that can flow through your dishwasher, showers, hot water heaters, and so on. You can typically find these specifications from the manufacturer of your appliances. Lower flow rates than the required rate can mean interrupted water flow, and no one wants that.

#2: Check to see if you have sediment build-up quickly.

Doing so is actually really easy. Make sure you do this especially if you live in an older building. Simply stop up your kitchen sink, fill it with water, and make sure the room is dark (ideally do this at night). Then, shine a flashlight at an angle into the water, and make sure you don’t see any sediment.

#3: If you want it done right, do it yourself.

While the EPA is responsible for figuring out regulation and providing clean drinking water, don’t always expect them to do so in a timely manner. Instead, do the testing yourself.

You can find out where your water comes from on the EPA’s Toxic Release Inventory Map to see which facilities it’s located by, and which toxic materials they’re allowed to release. In recent years, there have actually been many citizen efforts that have discovered major contaminations, so better safe than sorry!

#4: Double down on your efforts if your water is coming from a private well.

In these cases, the government isn’t required to test this water at all, so you must look for contaminants. In wells, definitely check for arsenic and radon, as well as bacteria. If you have a septic system nearby, make sure it’s not seeping into your household’s water supply!

Final Thoughts

We know that was a lot to take in, but have you decided which model is the best under sink water filter for you and your home? While these are all some of the supreme units out there, you must know what your water needs to create a safe and healthy environment for you and your family. We hope that our article has helped you select the perfect product. Thanks for tuning in, and we’ll see you again shortly!


HealthWellness365 is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program. HealthWellness365 earns fees from products sold through qualifying purchases by linking to Amazon.com. Amazon offers a commission on products sold through their affiliate links.

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Shayanne Weeks

Shayanne is a yoga instructor, freelance writer and personal trainer based primarily in LA, California. Describing herself as a traveler, she has lived in Seattle Washington, Guadalajara Mexico as well as Boise Idaho. As an extremely active person, she loves personal training, yoga instruction, and works part time as an in home health aide. She enjoys sharing her love for teaching others through her “how to” fitness guides, home health equipment and workout equipment reviews. In her free time Shayanne loves to surf, snowboard and practice yoga depending on where she is living.

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