9.33
/ 10
8.90
/ 10
8.83
/ 10
8.78
/ 10
8.75
/ 10
8.70
/ 10
8.33
/ 10
8.15
/ 10
7.65
/ 10

Contaminants Filtered

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Number of Contaminants Reduced
66
50+
40
25
50+
82
24+
16
14
Cysts
Chlorine
Lead
Asbestos
Mercury
Herbicides
Best Water Filter Systems: We spent more than 100 hours researching and testing the best water filter systems.
Reduce unwanted contaminants and improve your water's taste with a drinking filter system. Installing a water filter system under your sink can help clean up your drinking water.

Performance Features

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Maximum Feed Water Pressure (psi)
80
125
90
100
80
100
100
125
100
Flow Rate (gallons per minute)
0.5
0.65
Varies
0.5
0.5
0.5
Varies
1
Varies
Number of Stages
3
1
5
Reverse Osmosis
6
5
3
Reverse Osmosis
3
Replacement Frequency (months)
6
12
6
6
6
6
6
6
12
Replacement Frequency (gallons)
600
1,000
1,000
900
Information Not Available
750
Information Not Available
900
Information Not Available
NSF Certification

Design

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Easy-to-change Filters
DIY Installation
Replacement Notifications
Number of Faucet Options
3
4
1
1
3
1
5
1
1
Width (inches)
12
6
16
15
12
15.75
12.5
14
15
Depth (inches)
4.25
8
5.25
16
4.75
5.25
4.25
5.5
5
Height (inches)
9
9
17.5
15
14.5
14.25
17
15
21
Pounds (pounds)
3.4
9.5
26
13.5
8
35
22
21
4

Help & Support

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Warranty
1 Year
Lifetime
1 Year
1 Year
1 Year
1 Year
5 Years
1 Year
7 Years
Email
Telephone
Live Chat

Best Water Filter Systems

Finding the Water Filter System for You

We’ve been evaluating water filter systems since 2013 and spent hours doing online research, comparing product pages, reading reviews and consulting with industry professionals in search of the best filters on the market. The units we reviewed are all NSF-certified to meet strict health and safety standards. They are compact enough to fit easily under your sink, and most of them are easy to install yourself. They all have the features necessary to effectively reduce contaminants and make your drinking water taste better and be better for you.  

Best Overall – Aquasana 3-Stage Under Counter

The Aquasana 3-Stage Under Counter is a compact water filtration system that stows away nicely under your sink. This water filter rids your water of up to 60 contaminants, including heavy metals and organic chemicals, in three stages that each remove a different type of contaminant. As part of the purification process, naturally occurring elements like calcium, magnesium and potassium remain in the water. The combined effect of keeping the good and getting rid of the bad will result in better tasting water that is better for you.

Best Value – Apec Water ROES-50

Apec Water ROES-50 filters can reduce up to 40 different contaminants in your water with a five-stage process. Not only is this one of the more affordable water filters in our comparison – its filters last longer than average and only need to be replaced every six to 12 months after filtering about 1,000 gallons. Unfortunately, it doesn’t have an automatic notification to let you know when it needs replacing, so you’ll have to stay on top of it. This filter reduces all kinds of impurities to produce good tasting, safe water, and the company has a great support staff with plenty of contact options.

Best Warranty – WaterChef U9000

The WaterChef U9000 offers a simplified solution to water filtration with a single-filter system. This means you only need to worry about replacing one filter. It effectively filters out more than 50 contaminants and is covered by a limited lifetime warranty, which is far and away the best warranty we saw. Most of the systems in our lineup are covered for a year. It does have some limitations, such as filtering out mercury, bacteria or asbestos from your water. It does however keeps nutrients like calcium and magnesium in your water, which will improve its taste and nutritional value.

Water Filter Systems: What to Look For

The best water filtration systems remove several contaminants, have a long life and don’t take up a significant amount of space under the sink. Furthermore, these systems offer a long warranty. Here are the criteria we used to evaluate these products:

Pricing
Water filter systems tend to be relatively expensive. Some companies need to know more about your current set up before they can quote you a price for their product. We found that the least expensive water systems cost roughly $160 to $170. It isn't uncommon for some water filter systems to cost anywhere from $400 to $800. These more expensive systems should do a better job of removing contaminants from your drinking water and making it taste fresher. Some of these pricier units will let you know when the water filter needs to be changed, which can improve the life of your unit. Remember that you will need to replace your water filter every 6 months, which will also add to the cost of your water filter system.

Contaminants Filtered
Most likely, the reason you desire a tap water filter is to remove any unhealthy contaminants and improve the water’s taste, smell or color. The best water filters will reduce 10 or more contaminants. Furthermore, look for water purifiers that have been NSF certified. The NSF Certification tells you the product meets strict health and safety guidelines and is routinely tested to ensure those standards are met. The best filter systems provide a performance sheet to show test results under the NSF standards. These sheets show the specific contaminants that are reduced and how much of each contaminant the filter removes.

Performance Features
Under-the-counter water filters will reduce contaminants in different stages. It’s best to look for a filter that provides at least three separate stages to reduce pollutants from the water. Each stage will remove a different type of contaminant such as sediment, chemicals and residue. Furthermore, some filters can affect the pressure of the water. Systems that have a water pressure range of 55 to 65 psi are best since this is the ideal range for water pressure in your home. If you have a system with water pressure that is too strong, it can damage your pipes and cause leaks.

In addition, after a certain period of time, the filters on the system will need to be replaced. These can become costly if the faucet filters do not have a long lifespan. Six months is the average length of time most filters will last. A few filters, like the Kinetico AquaKinetic, have a lifespan of 12 months. The best systems have a notification system, whether by light or sound, that will alert you when it is time to replace a cartridge.

Design
You do not want a water filter system that is large and bulky and takes up all the space under your counter. Before purchasing a system, ensure that it will fit under your sink. A water filter like the Pelican Pro 6 is especially compact and should fit in tight spaces. Additionally, most of these products do not require professionals to install them; you can hook them up on your own. We recommend looking for systems that include installation kits and filters that are easy to change. On many of the best water filtration systems, you can change a filter by simply twisting it on and off.

Help & Support
Most water filters are covered under a one-year warranty. However, some manufacturers offer shorter time frames. Additionally, if questions or concerns do arise with your system, you want to ensure representatives are available, whether by email, telephone or live chat support.

Installing a water filter system is an easy way to keep you water safe as well as improve its taste, smell and color. A drinking water filter can be a little thing that has a lasting effect on your health.

Contributing Reviewer: Noel Case