12 Best Under Sink Water Filters to Eliminate any Kind of Contaminants

Reviewed by
Last updatedLast updated: December 13, 2021
CookSpot is reader-supported. We may earn a commission through products purchased using links.
CookSpot is reader-supported. We may earn a commission through products purchased using links.

Without enough information about these water purification devices, it can be downright impossible to pick the best under sink water filter. Don’t be misled by the ads that paint a perfect picture of the filters. Instead, study the features list for signs that you will be getting good value for your money.

The features that are worth most of your attention include the stages of filtration since you must know the processes that go into cleaning your water. Also, the flow rate is included here. Additionally, knowing how long the product will work for you is essential hence. You can look at the filter life for such details. A few other items to look at to ensure you acquire the best under sink water filter your money can buy are: dimensions, warranty, and ease of installation. Remember that the product should fit easily under your sink, and if you don’t want to spend money hiring a plumber, an easy-to-install device will come in handy.

Top 12 Under Sink Water Filters Review 2022

  • Filtration stages: 6
  • Flow rate: 75 GPD @50 psi, 90 GPD @ 60 psi
  • Filter life: n/a
  • Operating pressure: n/a
  • Dimensions: 16″ x 5.25″ x 17.5″
  • Warranty: 2-year extended

Other features: WQA certified, 100% lead-free designer faucet, removes 1000+ contaminants

The APEC Water Systems ROES-PH75 Filter System is our top pick as far as under sink water filter systems go. The machine is a favorite for a lot of people who want to have cleaner water coming out of the faucets installed in their sinks.

Fortunately, if your house is new and you don’t already have a faucet installed, you needn’t worry. The manufacturer has you covered and provides one for you. You can also add it as a third option in addition to the hot water and cold water faucets. Noteworthy is that this is a lead-free designer faucet that will make almost any kitchen sink look better.

This water filter incorporates six filtration stages in the device. The result is that water passing through the device will leave behind chlorine, toxic fluoride, arsenic, nitrates, and other contaminants. In fact, the total number of contaminants that the device can get rid of is more than 1000.

Even as the device does all this, it still manages a reasonable flow rate for you to work with. If you are using water with a pressure of 50 psi, you are going to get a flow rate of 75 gallons of water in a day. Conversely, if your water pressure is 60 psi, the flow rate has to increase as well to 90 GPD.

You will as well note some pipes connecting the various components of the filter. These pipes are food-grade so that toxins are not re-introduced to your water after purification. Also notable are the quick connect fittings. These make the whole process of installation a breeze to walk through.

The best part of the quick connect fittings is that they are leak-proof. With that being said, instructions on how to put together and fit the device under your sink are provided. For those who find written instructions too hard to follow, you can opt for video instructions as well.

Also, calcium minerals are added to your water as it passes through the filter. Better-tasting alkaline water is the result. Lastly, the machine has received the Water Quality Association certification.

What are its best features?

  • WQA certified
  • 2-year warranty
  • Calcium is embedded in the product for better-tasting alkaline water results
  • Easy to install
  • High flow rate
  • Food grade materials are used in construction
  • The filter comes with a faucet
  • The machine eliminates 1000+ toxins from water

What could be improved?

  • Some users have mentioned the device wastes a lot of water
  • For some, the manual is not as clear as they would like it to be
  • Filtration stages: 3
  • Flow rate: n/a
  • Filter life: 2,000 gal.
  • Operating pressure: n/a
  • Dimensions: 13.75” x 16.75” x 3.25”
  • Warranty: lifetime

Other features: removes up to 99.9% of 232+ contaminants, quick installation, tested to NSF & EPA standards

The Clearly Filtered Triple Stage Kitchen Faucet Filtration System stays true to its name by having three filtration stages in its design. Of course, since the impurities in the water are removed, the resulting purified water is likely to be better tasting.

As mentioned above, the filter life for this machine is rated at 2,000 gal of water. As such, you will, at some point, have to change filters in the tool. There are some guidelines provided for you to cater for the size of your household. This is in regards to how long you should wait before making the all-important decision to change filters.

Single people can wait as long as 15 months before they have to purchase a new filter and use it to replace the old one. Couples can wait 12 months, and those who feel their families are large enough shouldn’t wait more than nine months.

Since the Faucet Filtration System doesn’t require any tools to install, there is no need to hire a plumber. Just dedicate an hour or less to the installation, and you should be able to figure it out.

If you are still not sure of yourself in your DIY capabilities, you can call up a plumber, although, with that, you should be prepared to pay a price. In addition to the above attributes, the filter comes with a lifetime guarantee. You can make your claim if you are unsatisfied with the product by calling up the manufacturer and lodging your complaints.

As to the effectiveness, it removes 232+ contaminants trying to come into your life through the kitchen faucet. Finally, if the filter is good enough for NSF & EPA standards, it should be good enough for you.

Why is it special?

  • NSF & EPA certified
  • Removes 232+ contaminants
  • Users get better-tasting water
  • Easy to install
  • Lifetime product guarantee

What are the flaws?

  • Expensive
  • The filter lowers water pressure

Home Master TMAFC-ERP Reverse Osmosis Water FilterBest Reverse Osmosis Filter

  • Filtration stages: 7
  • Flow rate: 75 GPD
  • Filter life: 2,000 gal.
  • Operating pressure: 40 – 90 PSI
  • Dimensions: 12” x 16” x 20”
  • Warranty: 5-year limited

Other features: 40 – 100F, modular design, Full Contact Technology, 1:1 water waste

Another filter option that can give you a 75 GPD flow rate is available in the Home Master TMAFC-ERP Reverse Osmosis Water Filter. The machine has the same filter life as the Clearly Filtered Triple Stage Kitchen Faucet Filtration System. You can use the same guidelines provided for the premium pick to determine when to change the filters.

Remember that changing filters doesn’t need you to incorporate any tools at all. Also, for the flow rate to be as high as it is, a non-electric permeate pump is built into the device.

This product as well has the highest number of filtration stages listed, which total seven. If the number of filtration stages is a benchmark for high quality in your reverse osmosis water filter, then this device passes the exam with flying colors.

Despite removing a lot of materials from your water, the tool also seems to add some. These are calcium and magnesium minerals. Of course, these minerals have the benefit of adding flavor to your water and making it less acidic. They are also good for your body.

To get the best output from the Home Master TMAFC-ERP Reverse Osmosis Water Filter, ensure water pressure in your kitchen pipes is between 40 and 90 psi. As for installation, most of the device comes assembled, and this leaves you with minimal work. Finally, a five-year warranty is there if you need it.

What are our favorite features?

  • Excellent flow rate statistics
  • Adds minerals to your water to improve taste and reduce acidity
  • Five-year warranty
  • Offers a total of seven filtration stages
  • Changing filters is a walk in the park

What could be better?

  • Installation may be a bit difficult
  • Written instructions on the use of the filter are difficult to follow
  • Some users have reported leaks

Brondell Circle Reverse Osmosis SystemBest Filter Case

  • Filtration stages: 4
  • Flow rate: 56.9 GPD
  • Filter life: 475 gal. (3 months)
  • Operating pressure: 40 psi – 120 psi
  • Dimensions: 9.25” x 16.5” x 13.75”
  • Warranty: 1-year limited

Other features: 41º F – 95º F, Gold Seal-certified, NSF/ANSI certified, designer faucet, fast refill, auto-flushing, twist-and-seal filter changes, ‘quick-connect.’

As far as the design of the Brondell Circle Reverse Osmosis System goes, it is unique. The water filter components and a cistern are housed in the sleek casing shown above. In this case, water is passed through four filtration stages before it can be allowed to come through the faucet.

Remember that the tool comes with a faucet as well. Also, you get twist-and-seal filters. For this reason, you won’t need to call any experts in plumbing when three months are up, and you need to change filters.

Given how short the filter life is, it might be an expensive affair purchasing replacements. Some of you won’t mind this at all. Moreover, you get an extra benefit from choosing this filter in the form of a reminder LED. Other models rely on you having to remember to change the filters. This model tells you when your current filter is filled with grime and chemicals.

We have already mentioned the tank in the case shown above. What we haven’t mentioned is that it has a capacity of 6L. This tank is filled with clean, purified water in a matter of an hour if the device is working.

Also, the operating pressure for the device seems to be adequate for most households. Lastly, the tool has been certified by a couple of authority organizations, including NSF/ANSI and the Water Quality Association.

What stands out?

  • Multiple certifications showing the effectiveness of the water filter
  • Fast refill of the 6L water tank
  • The filter comes with a faucet as well
  • The case provides for compact placements of water filter components
  • You get a reminder when you need to change filters
  • Easy to change filters
  • Easy to install

What cons did we manage to find?

  • For some, the flow rate is quite low
  • Filtration stages: 5
  • Flow rate: 50 GPD
  • Filter life: 6 months
  • Operating pressure: 40-80 PSI
  • Dimensions: 16.18” x 18.75” x 18.06”
  • Warranty: 1-year limited

Other features: double sealed filters, quick connect adaptor, chrome faucet, NSF certified

Spending about $170 on the Express Water Reverse Osmosis Water Filtration System isn’t a bad investment either. Remember to check for current pricing using the links we have provided since the price can change over time. Nevertheless, if you do decide to spend your money on this product, you receive five filtration stages put together in one device.

Some of the more common water contaminants you can expect to get rid of with this purchase are chlorine, Nitrates, Arsenic, Bacteria, Lead, and more. Once the device has gotten rid of these things, you then get a flow rate of 50 GPD.

Also, it is a legitimate fear for homeowners to come home and find their kitchen flooded due to a leak in their filter. You needn’t worry about that if you buy the Express Water Reverse Osmosis Water Filtration System. It comes fitted with a leak detector which functions to shut off the water if moisture is detected.

Also, while this is a reverse osmosis filtration system, it can be coupled with additional filtration attachments. Some examples include an alkaline water filter, de-ionization water filter, and UV water filter.

Additionally, the filters that are already included in the package are double sealed. This adds a bit of filtration efficiency. If you rummage through the contents of the package you receive, you will note the presence of a brass feed adapter. This component’s compatibility with most under sink pipes is quite welcome.

Also, you can find in the box a quick connect adapter as well. Do remember that a six month period is the maximum you should go without changing filters.

What are our favorite features?

  • You get color matched labels to help you place the filter components where they are supposed to be
  • The tool is compatible with additional filtration attachments
  • You get a leak detector with the product

What could be better?

  • Low water pressure
  • Some people dislike the taste of the water coming out of this system

CuZn UC-200 Under Counter Water FilterBest Filter Life

  • Filtration stages: 3
  • Flow rate: 2 GPM
  • Filter life: up to 5 years
  • Operating pressure: n/a
  • Dimensions: 4.5” x 4.5” x 15”
  • Warranty: 5-year limited

Other features: NSF certified Standard 42 and 61, braided stainless steel compression hose

The CuZn UC-200 Under Counter Water Filter is an option that you can even forget about once you are done with installation. After all, filter life is about five years. If you are looking to save up on long-term expenditure, you do so by purchasing this device since purchasing filters regularly has been eliminated.

Further, the manufacturer is bound to be proud of the braided stainless steel pipe. Given its construction, you as well don’t need to worry about the lifespan of this pipe.

An adjustable wrench is one tool you will need if you are to connect this to the cold water line in your kitchen. A similarity between this product and the Woder WD-S-8K-DC Water Filtration System is that beneficial minerals are left in your drinking water.

Moreover, despite the compact singular design of the purchase, the tool incorporates three filtration stages. Also, some of you may not have standard plumbing in your house. However, you can put yourself at ease since it is possible to call customer care and get a non-standard install kit at no additional cost.

What makes it stand out?

  • Beneficial minerals are not removed from your drinking water
  • Durable pipe construction
  • Long filter life
  • You can get a free install kit even if you don’t have standard plumbing in your house

Which disadvantages must you keep in mind?

  • Water flow is low
  • The taste of filtered water from this device is not everybody’s cup of tea

APEC WFS-1000 3-Stage Under-Sink Water Filter SystemBest Non-TDS Removing Filter

  • Filtration stages: 3
  • Flow rate: n/a
  • Filter life: over 12 months
  • Operating pressure: 20-85 psi
  • Dimensions: 6” x 15” x 12”
  • Warranty: 1-year limited

Other features: 100% Lead-Free chrome faucet, FDA certified JG food grade tubing

As for those looking for an under sink water filter for well water, the APEC WFS-1000 3-Stage Under-Sink Water Filter System may be the device for them. With its three filtration stages, the tool will work with water pressure as low as 20 psi.

While this is a go-to option for the removal of chemicals and their odors from your drinking water, it doesn’t get rid of total dissolved solids. This may help with keeping the essential minerals in the water that you drink.

Furthermore, you needn’t worry about matching this filter with your old faucet since it comes with one of its own. This is coupled with food grade tubing to keep the consumable quality of the water intact.

The filter lifespan is about 12 months. Remember that if you want to keep enjoying fresh, clean water after this, you need to buy new filters to take the place of the old ones.

Why is it special?

  • Comes with a lead-free chrome faucet
  • Consumable minerals in water are left intact
  • Works with well water as well
  • Food grade tubing is used in construction

What are the flaws?

  • The filter doesn’t work on TDS
  • Low flow rate

Woder WD-S-8K-DC Water Filtration SystemBest Single Stage System

  • Filtration stages: 1
  • Flow rate: 2GPM @65 psi
  • Filter life: 8,480 gal.
  • Operating pressure: n/a
  • Dimensions: 4” x 3” x 25”
  • Warranty: n/a

Other features: direct connect hoses, Gold Seal certified, NSF/ANSI certified

If you are in search of an under sink water filter system without too many components, you should pick the Woder WD-S-8K-DC Water Filtration System. However, with this pick, you give up having multiple filtration stages.

That notwithstanding, the filter life seems to be quite long as compared to others listed like the Brondell Circle Reverse Osmosis System. Also, the flow rate is acceptable for such a small device.

Additionally, remember that you will be saving some money by picking this filter. You are supposed to use this filter with municipally treated water. If you use it with well water, you might not get the results that you want.

Also, unlike reverse osmosis water filters, this machine is not going to filter out all minerals. Instead, it will take out all harmful minerals and leave you with some that add nutritional value. Some of the minerals left behind include phosphorus, magnesium, Calcium, Sodium, and more.

Additionally, be careful not to use the product with hot water as then the filtration may not work. If you use the filter with salty or softened water, you may also be reducing the filter life.

The image above shows two direct connect hoses. One connects to the water source while the other connects to the faucet. As you can see, you won’t need to call Jack or Bob the plumber to install this filter for you.

Finally, you can bank on the tool’s effectiveness as a result of the certification it has received.

What makes it stand out?

  • The filter is certified by several bodies hence should provide you with clean water
  • The tool doesn’t remove beneficial minerals from your drinking water
  • Easy to install
  • Compact

Which disadvantages must you keep in mind?

  • It cannot be used with well water, softened water or salty water
  • No warranty
  • The filter life quote in the product description may be a little misleading

Frizzlife Under Sink Water Filter SystemBest Compact Filter

  • Filtration stages: 2
  • Flow rate: 2.0 GPM @40 psi
  • Filter life: 1,600 gal.
  • Operating pressure: n/a
  • Dimensions: 5” x 5” x 13.5”
  • Warranty: n/a

Other features: 0.5 microns, auto shut-off design, fast installation

If you have either a ½” or 3/8” cold water line under your sink, then this tool will fit right in. You won’t even need specialized plumbing tools to get the installation done. Moreover, the process can even take less than ten minutes.

To be as prepared as possible for the installation, remember to check out the videos of the product. Additionally, you can likely see that the filter life will allow for 1600 gal of water to be cleaned.

It does get exciting when you have to change the filter as well. The product comes with an auto shut-off valve that activates when changing filters. Of course, with this, you eliminate the need to shut off the main water supply for the house.

What makes it special?

  • Easy and fast installation
  • Changing filters is easy
  • Compatible with standard cold water lines
  • Affordable

What cons did we find?

  • Water flow is not the most impressive though it should prove sufficient
  • Although a relative measure of quality water doesn’t taste as good for some individuals

Filtrete 3US-PS01Best Value

  • Filtration stages: 1
  • Flow rate: 1.5 GPM
  • Filter life: 2,000 gal.
  • Operating pressure: 25-125 psi
  • Dimensions: 4” x 6.8” x 14”
  • Warranty: 1-year limited

Other features: NSF certified Standard 53 and 42, 0.5 microns, 40-100F

In three steps, you can have the Filtrete 3US-PS01 Advanced Undersink Water Filtration System installed and working in your kitchen. As such, the whole process is likely to take significantly less than 30 minutes.

Once installed, you can say bye to sediment, chlorine taste, chlorine odor, and microbial cysts in your water. Also, you have a six-month grace period before you need to change filters.

While there are no physical reminders to change filters on the device, there is a way to ensure you don’t forget. You text the keyword Water to the number 23624. That way, when your six months are up, you will get an alert on your phone telling you there is something you need to do.

Moreover, since the product has been tested and certified, it should be able to live up to a lot of people’s needs and expectations. Remember that your water needs to be between 40° and 100°F in temperature for optimum filtration.

Finally, this filter is certified by NSF, and you receive a one-year warranty.

What are its best features?

  • NSF certified
  • One-year warranty
  • Easy to install
  • You can get reminders via text for when you need to change filters

What could be improved?

  • Taste of water from the system doesn’t appeal to everybody
  • The smell of water as well maybe too funky for some
RELATED: 10 Best Inline Water Filters – Stop Worrying About the Purity of Your Water!

Aquasana AQ-5300 Under Sink Water Filter SystemBest Filter With Faucet

  • Filtration stages: 3
  • Flow rate: 0.5 GPM
  • Filter life: 600 gal.
  • Operating pressure: 20-80 psi
  • Dimensions: 12” x 4.25” x 9”
  • Warranty: 1-year

Other features: NSF Standards 42, 53 + 401, and P473; 100% Lead-Free chrome faucet

The Aquasana AQ-5300 Under Sink Water Filter System with its faucet is another impressive addition to the list. However, the flow rate is significantly lower than you will find in most other options. That being said, you can work around this if the only thing you need from the product is drinking water.

After 600 gallons have passed through the filter and it is finally time to change it, you twist off the housing and remove it. After that, you can put the new one in, twist the housing back on and go back to your daily business.

A disclaimer, if you are planning to purchase this product, is that it doesn’t work to remove TDS. However, the reverse osmosis options mentioned in this list will work fine if you are looking to remove all minerals from your water.

The chrome faucet is a plus, as is the NSF standards certification.

What makes it stand out?

  • NSF certification
  • Easy to change filters
  • Comes with a lead-free chrome faucet
  • Works with even low pressure of around 20 psi
  • Easy to install

Which disadvantages must you keep in mind?

  • Low flow rate
  • Some users have experienced leaks

Aquasana AQ-5200 Under Sink Water Filter SystemBest NSF-Certified Filter

  • Filtration stages: 2
  • Flow rate: 0.5 GPM
  • Filter life: 500 gal.
  • Operating pressure: 20-80 psi
  • Dimensions: 12” x 4.25” x 9”
  • Warranty: 1-year limited

Other features: NSF certified to standards 42, 53, 401 +P473; 100% lead free metal faucet; 40-90F

You can choose a 2-stage filtration system from the Aquasana manufacturer as well. The filter life is rated at 500 gal, which is one of the lowest listed. However, if you have sufficient filter replacements waiting for the day you will need them, this isn’t something you will worry about.

You even get similar benefits to those of the Aquasana AQ-5300 Under Sink Water Filter System. The NSF certification is one of them in addition to the 0.5 GPM.

Further, a lead-free metal faucet is provided just in case your current faucet is incompatible with the system.

Why did it make our list?

  • You are provided with a lead-free metal faucet
  • Easy installation
  • 1-year limited warranty
  • NSF certification
  • Retains all healthy minerals

What is not ideal about it?

  • Flow rate is wanting

Things to Consider

A good under sink water filter will check both boxes of functionality and affordability. As for the latter, it is quite easy to tell if you can afford something by looking at the price. The functionality box is a little trickier to fill. You need to check on features and how they apply to your needs. With the guide below, you will find the work you have to do in this regard much easier.

Why install an under sink water filter?

12 Best Under Sink Water Filters to Eliminate any Kind of Contaminants

Some of you have tried to drink water straight from the tap only to find that you can’t stomach it. First, the problem may be the taste puts you off from drinking it. In another scenario, you may like the taste only for the smell to come in and make drinking the water an unpleasant affair.

The chemicals in the water, as well as dissolved solids, may also not agree with your body. Do remember that you can encounter all three of these situations at once as well.

An under sink water filter, depending on the model, can eliminate one, two, or all three of the unpleasant scenarios mentioned. In a few instances, it can also improve the taste of the water you are drinking.

How does an under sink water filter work?

Under sink water filters are simple mechanisms if you break them down. They include removable filters in the design. Also, the devices mentioned above are all connected to both a cold water supply and a faucet. As such, the water has to pass through the machine.

The removable filters eliminate all the contaminants from the water. This may be in the form of chemicals or solids. Remember that these contaminants are left on the surface of the removable filter. For this reason, it is only a matter of time before you need to replace the filters.

The products with more filtration stages are characterized by having a couple of removable filters. Even reverse osmosis water filters work more or less the same way. The devices have fine membranes that water is forced through. The fine membranes also work to stop the contaminants from going through.

Some users view reverse osmosis filters as being a little too good at their job. After all, they do eliminate even the useful minerals such as Calcium and Sodium. Nevertheless, others prefer reverse osmosis under sink water filters simply because they guarantee the elimination of even dissolved chemicals.

Features to consider when choosing an under sink water filter

Some of you may like water with certain minerals in it, while others would prefer the elimination of all but the water molecules. As such, these two groups cannot pick the same device and hope for similar levels of satisfaction.

Similarly, what you hope to achieve with your water filter will dictate which option you go with. Remember that one or two features may make or break your experience with the under sink water filter you buy. As such, scrutinize all the features listed. Where you find that certain features or terms mentioned are confusing, you can check the descriptions below for clarity.

Type of filter

12 Best Under Sink Water Filters to Eliminate any Kind of Contaminants

The designs and effectiveness of the above filters vary from model to model. Naturally, one would assume that there are different types of under sink water filter systems as well, and they would be right.

One common type is the simple water filter. An example of such a filter is the Frizzlife Under Sink Water Filter System. There is no dedicated water faucet provided with the invention. As such, installation means connecting the filter with the cold water line and the existing sink faucet directly. Also, the installation of such a filter is much easier.

Among the competition is the conventional filter with a dedicated faucet. A tap is as well provided. The APEC WFS-1000 3-Stage Under-Sink Water Filter System and the Aquasana AQ-5300 Under Sink Water Filter System are two excellent examples of the same.

With the simple filter as well as conventional filters, you don’t need a lot of pressure for the water to be purified. The water simply passes through the various filtration stages, leaving sediment and contaminants behind. As for the reverse osmosis system, it is a different ball game.

The fine membrane in RO water filters is hard to pass through even for water. As such, pressure is applied to water to force it through. Most contaminants have larger molecules and thus will be left behind. Chemicals that have dissolved in the water will also face the same fate.

Contaminants it removes

As we already mentioned, some people prefer some minerals in their water while others do not. The CuZn UC-200 Under Counter Water Filter is a classic case of an under sink water filter that doesn’t get rid of all the minerals.

Some may find the Home Master TMAFC-ERP Reverse Osmosis Water Filter a paradox since it eliminates most minerals from the water then re-introduces a few of them later in the filtration process. This is meant to improve both the alkalinity and the taste of the final product.

What you prefer is what you should get. If you want drinking water that you are sure has negligent levels of dissolved solids, you should go for that option. If you want water that leaves behind some minerals, you can get that as well.

Nonetheless, a lot of under sink water filter users are adamant that there shouldn’t be any chemicals in the water and that odors should also be eliminated.

Micron ratings

12 Best Under Sink Water Filters to Eliminate any Kind of Contaminants

While you are giving ratings to the under sink water filters you are looking at, remember to check out the micron ratings as well. In layman’s terms, micron ratings show the size of the spaces that water goes through in the filter.

Moreover, you should remember the smaller the rating, the less materials it can allow to go through. The Filtrete 3US-PS01 Advanced Undersink Water Filtration System mentioned above has a rating of 0.5 microns. This means that materials that are bigger than 0.5 microns will be held back while bacteria that is about 0.4 microns may get through.

Noteworthy is that a rating of 1 micron is often enough for most water filter needs. However, the smaller you can go, the better. Also, realize that under sink water filters with smaller micron ratings are bound to be higher priced.

Flow rate

The flow rate deserves a place on the list of things you are going to check out when considering your water filter options. You may, however, need to plan how you are going to use the filtered water.

Some of you will want to use the water for washing dishes, cooking, drinking as well as a bunch of other uses. Nevertheless, if the flow rate is low, you might end up spending the whole day cleaning a few dishes.

Alternatively, your filtered water faucet may be exclusively for drinking. If there aren’t many people in your house, it shouldn’t be problematic for you to pick a low flow rate. However, whenever you have guests over, you might find yourself spending a lot of time at the sink trying to fill everyone’s glass.

To be safe, try getting as high a flow rate as possible. Devices like the APEC Water Systems ROES-PH75 Filter System come to mind since it can even get up to 90 GPD. The downside to a high flow rate is that it may be highly-priced.


Filter life

Next on the features list is the filter life. We have already established that you need to change filters at some point. This is because the more materials that the filter collects, the less effective it is. At some point, it won’t be able to purify your water anymore.

Furthermore, you will be provided with the first set of filters. After that, you are on your own. For some of you who are handy around the house, you can get by with changing the filters yourself. Others will rely on the services of a plumber every time a filter needs changing.

Remember that hiring a plumber can be expensive. If you don’t hire a plumber, you will still need to dedicate some of your time to get the replacement job done. We haven’t even mentioned the price of new filters.

All these scenarios tell us that it would be ideal to have filters that last longer. That way, you needn’t spend a lot of your money buying filters now and then. For those who opt to hire plumbers for the process, you get to save money.

For the above reasons, inventions like the CuZn UC-200 Under Counter Water Filter are perfect for a lot of you. The five-year filter life can save you a lot of hassle as compared to the competition that typically lasts a year or less.

Operating pressure

12 Best Under Sink Water Filters to Eliminate any Kind of Contaminants

The operating pressure of the filter purchase could also be instrumental in shaping your experience with the invention. You want a device that can easily handle as much pressure as possible. An example is the Brondell Circle Reverse Osmosis System, which will work even when pressure is at 120 psi.

In comparison, a device like the Home Master TMAFC-ERP Reverse Osmosis Water Filter can handle a maximum of 90 psi. As such, if the water in your home comes into the filter at 110 psi, the device is going to struggle at keeping some of the contaminants out. The result is that your water won’t reach the level of purity you were looking for.

For most people, higher operating pressure is a good thing, especially if they haven’t gotten around to measuring the water pressure in their homes.

Others have already checked out the maximum water pressure in their premises on various occasions and know that the pressure doesn’t go above a certain point. This makes it a breeze to plan for the operating pressure of their under sink water filter system.

Lastly, they can save some money since a higher operating pressure will often require you to pay more money for the invention.

Operating temperature

You as well know that temperatures in your household are going to vary from time to time. Also, temperatures will affect the working condition of your under sink water filter.

For the Brondell Circle Reverse Osmosis System, for instance, the working temperature is between 41º F and 95º F. As such, if the temperatures of the water and surrounding goes below 41° F or above 95° F, you may not get the clean water that you are used to.

To avoid any inconveniences, go for the product whose operating temperature would work for your situation. Of course, you cannot go wrong with a wider operating temperature range.

Ease of installation and filter replacement

Some of the under sink water filters mentioned above are straightforward to install. In fact, they don’t even need any specialized tools for you to get the job done. Others require that you have full plumbing equipment. As such, some of you may feel it easier to call up that plumber you know rather than go to Home Depot, get some tools, then come back and do the installation.

Remember that getting any step of the installation wrong can ruin the entire device. Those of you are not handy with tools that may not want to risk that as well. Also, you will be required to change filters at regular intervals. You don’t want a tool that gives you a headache every time you think about potentially changing filters.

The under sink water filters that are easy to install will save you a lot of trouble in the long run.

12 Best Under Sink Water Filters to Eliminate any Kind of Contaminants


While most companies do everything to ensure the products they ship out are high quality, and in perfect working conditions, some bad apples slip through the cracks. You may receive these products.

If you didn’t buy a product with a comprehensive warranty, the manufacturer is under no obligation to ensure your satisfaction. As such, if the filter fails or breaks down after a few days, you can repair it out of pocket or look for a better option.

Of course, the most advantageous course of action is one that avoids this situation as a whole. Get a product with a warranty to lessen the inconveniences you may encounter. Also, getting one that covers you for a long time is always best.

Other features

Coming across some extra features shouldn’t be surprising. After all, each manufacturer is trying to outdo the competition and get you to buy their filters. These other features, whether they are an auto-shutoff valve, faucet, auto flushing, or more, will probably make your use of the filter much more enjoyable.

Our advice in this regard is that if you can get as many extra features as possible in your filter purchase. You can also look into which are the most beneficial and prioritize them. Noteworthy is that a lot of these features will raise the price of the tool. As such, check on what your budget allows and go for that.


If you have decided that a plumber is unnecessary, you may need direction as to how to navigate the installation process. Nevertheless, before you begin anything, turn off the water supply into your house. This will allow for a less messy installation process.

Some under sink water filter systems come fully assembled while others need to be put together. Unfortunately, if you picked the latter, there is no one size fits all for assembly. You will thus have to put the filter together as per the instructions provided by the manufacturer.

At this point, disconnect the cold water supply line and the pipe supplying the cold water faucet. You can then connect the two-piece fitting or adapter provided to the cold water line.

Where you have bought a conventional water filter, the adapter provided will allow you to reconnect the original cold water faucet. This is in addition to the filtered water faucet that comes with the purchase.

You can then take out the plastic pipe that comes with the purchase and connect it to the adapter. Some models will have a shut-off valve to incorporate here as well. Also, some filters have mechanisms that allow for the connection here to be quite stable.

The plastic pipe is then fed into the water filter. Something we haven’t mentioned before is that some sinks already have an extra hole that you can use for the new faucet while others don’t. You may need to drill into them to create one.

The hole should be about 13 millimeters, and you should ensure a snug fit for the faucet even if you have to use putty. Also, before you install the faucet permanently, ensure that you have attached the plastic tubing provided.

The last step for the conventional water filter is attaching the plastic tubing hanging from the faucet to the filter outlet. This is done under the sink. For the models that don’t come with an extra faucet, you just connect the filter outlet to the existing cold water faucet.

You can attach the filter to the wall if you want a neater installation. You can then go and turn the house water supply back on. Remember to open the faucet and test the water that comes out.

There are often different guidelines governing how long you should wait before changing filters. The product you buy should have instructions on whether you should wait six months, a year, or even longer.

NSF certified means that the National Sanitation Foundation has tested the products and found them to fulfill the food safety and sanitation standards that the organization has created. These standards are meant to promote public health. As such, a filter with an NSF badge should provide you with water that is safe to drink.

Our Verdict

If you haven’t already guessed, our top picks are the APEC Water Systems ROES-PH75 Filter System, Clearly Filtered Triple Stage Kitchen Faucet Filtration System, and the Home Master TMAFC-ERP Reverse Osmosis Water Filter.

The APEC Water Systems ROES-PH75 Filter System is just one of those impressive all-around tools. You can see that in the number of contaminants it gets rid of, flow rate, and even the minerals it adds towards the end of the filtration process. Even entire families will likely not have many complaints about their drinking water if they have one of these around.

Next up is the Clearly Filtered Triple Stage Kitchen Faucet Filtration System, which is a pricey but effective filter. The purchase is a bit compact with various certifications. Lastly, the quick installation and lifetime warranty are significant positives.

As for the Home Master TMAFC-ERP Reverse Osmosis Water Filter, finding a more effective reverse osmosis system is a tall order. Flow rate, warranty, filter life, and the 1:1 water waste ratio all serve to bring it up in the rankings.

We hope you find the water filter information above informative and essential for your under sink water filter purchasing efforts.

Leave a Reply

Your email address will not be published. Required fields are marked *