15 Great Under Counter Water Filters For Sale (Your Incognito Kitchen Pal)

Are you looking for a convenient way to filter water directly from your kitchen tap?

Do you need a water filtration system that won't take up that limited counter space you're always losing when you need it most?

Are you looking for great under sink water filters that could give you clean drinking water at the sink installation of your choice?

If you've asked any of these questions above, you're definitely in the RIGHT PLACE. Read on...

Our Top Recommendation

iSpring RCC7AK 6-Stage Superb Taste High Capacity Under Under Sink Reverse Osmosis Drinking Water Filter System with Alkaline Remineralization - Natural pH, White
1,878 Reviews
iSpring RCC7AK 6-Stage Superb Taste High Capacity Under Under Sink Reverse Osmosis Drinking Water Filter System with Alkaline Remineralization - Natural pH, White
  • High Capacity Reverse Osmosis water filtration for safer, healthier water. This under sink mounted water filter and...
  • Experience clean, safe, good-tasting water every time you turn on the faucet. Enjoy crystal clear ice cubes,...
  • The RO membrane removes not only harmful pollutants but also a few helpful minerals. As a result, a standard 5...

Last update on 2019-08-22 at 04:28 Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on [relevant Amazon Site(s), as applicable] at the time of purchase will apply to the purchase of this product.

OUR FAVORITE PICK
iSpring RCC7AK 6-Stage Superb Taste High Capacity Under Under Sink Reverse Osmosis Drinking Water Filter System with Alkaline Remineralization - Natural pH, White
Culligan US-EZ-4 EZ-Change Undersink Drinking Water Filtration System with Dedicated Faucet, Premium 500 Gallon Filter Included
Aquasana 3-Stage Under Counter Water Filter System with Brushed Nickel Faucet
CuZn UC-200 Under Counter Water Filter - 50K Ultra High Capacity - Made in USA
APEC WFS-1000 Super Capacity Premium Quality 3 Stage Under-Sink Water Filter System
1,878 Reviews
1,251 Reviews
537 Reviews
827 Reviews
328 Reviews
OUR FAVORITE PICK
iSpring RCC7AK 6-Stage Superb Taste High Capacity Under Under Sink Reverse Osmosis Drinking Water Filter System with Alkaline Remineralization - Natural pH, White
1,878 Reviews
Culligan US-EZ-4 EZ-Change Undersink Drinking Water Filtration System with Dedicated Faucet, Premium 500 Gallon Filter Included
1,251 Reviews
Aquasana 3-Stage Under Counter Water Filter System with Brushed Nickel Faucet
537 Reviews
CuZn UC-200 Under Counter Water Filter - 50K Ultra High Capacity - Made in USA
827 Reviews
APEC WFS-1000 Super Capacity Premium Quality 3 Stage Under-Sink Water Filter System
328 Reviews

Last update on 2019-08-22 at 04:28 Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on [relevant Amazon Site(s), as applicable] at the time of purchase will apply to the purchase of this product.

The fact that water quality isn’t assured for local communities these days is a sign that you should install some type of under sink water filters. This is particularly true if the place you’re in is known for having issues about the water source, or the basic filtration as provided by the local water services.

Unfortunately, many of the small-scale solutions have the following issues:

For water filter pitchers, the problem is two-fold: you can only filter so much water at a given time, and at the same time, the filtering process is gravity-based, so you may have to wait for some time to have your filtered water ready for use. won't have this limitation in most cases.

For countertop filters, the issue is about space and aesthetics: few countertop filters look elegant, and usually are relegated to the secondary kitchen. Even then, they tend to take up space on the countertop, which can be a hindrance for food preparation. In terms of water throughput, even larger countertop filters will have a limit to how fast they can filter water. It probably won’t be the same as the normal output from your tap.

If you encounter these limitations, but you feel you aren’t ready yet to invest in a full whole-house water filtration system, then your best choice is to use an under counter or under-sink water filtration system.

15 Great Under Sink Water Filter

1. CuZn UC-200 Under Counter Water Filter

CuZn UC-200 Under Counter Water Filter - 50K Ultra High Capacity - Made in USA

If you’re looking for one of the best under sink water filters, consider the CuZn UC-200 Under Counter Water Filter as one of your options. This product is a great choice for any family looking to take care of filtration needs on municipal water supplies. All you have to do to hook up this product is install it on your existing cold water line in the kitchen, and it only takes a few short minutes to complete this process. In no time, you’ll have cold, clear, filtered water right out of your kitchen faucet with none of the hassle of more complicated water filter systems.

Pros

  • It’s easy and simple to install this water filter without the need for any complicated or difficult tools other than a wrench for tightening purposes. 
  • This filter offers three stages of filtration for a powerful product in a small size.
  • The filter is designed to resist the growth of both mold and bacteria inside the product, making it safer and cleaner than ever before.

Cons

  • Some customers report disliking the aftertaste of the water when this product is installed, although this is open to interpretation. 
  • Some customers have had trouble with the installation process and have noticed the filter leaking right after it’s been installed.
  • In some instances, the filter may not fit the existing plumbing in your kitchen, although this is very uncommon.
  • Water Filter #1: CuZn UC-200 Under Counter Water Filter

2. APEC WFS-1000 Super Capacity Premium Quality 3 Stage Under-Sink W​​​​ater Filter System

APEC WFS-1000 Super Capacity Premium Quality 3 Stage Under-Sink Water Filter System

The APEC WFS-1000 Super Capacity Premium Quality 3 Stage Under-Sink Water Filtration System is an under sink water filtration option that is sure to make your home’s water much cleaner, healthier, and better-tasting than ever before. This product features three separate filtration chambers that allow your water to be cleaned and filtered thoroughly before it ever comes out of your tap. And since it’s designed to fit under your kitchen sink, this product is not only easy to use but also much easier to install than some of the other whole-house options on the market today. Best of all, the product features tubing that is certified by the FDA to be food-safe.

Pros

  • This water filter comes with five feet of tubes so it’s easy to install just about anywhere and under just about any sink. 
  • The filter includes lifetime support from the company, so if you ever have a problem, question, or concern, you can get in touch with APEC and they will help you solve the issue no matter how long you’ve had your filter installed.
  • This product comes with a new faucet to install in your kitchen sink that is designed specifically to work with this water filter and contains no lead, making it a safe option as well as a convenient one.

Cons

  • Many customers have reported having a lot of trouble getting the faucet installed tightly enough to work without developing a leak early on, and some customers have had to hire a handyman to take care of this problem. 
  • The included instructions may not be thorough enough for all customers to follow easily, especially those who are inexperienced with this type of installation. 
  • In some instances, the water from this faucet and filter may taste strange or may have a noticeable salty taste, especially if you also have a water softener installed in your home.
  • Water Filter #2: WFS-1000 Under-Sink Water Filter System

3. iSpring RCC7AK 6-Stage Superb Taste High Capacity Under Sink Reverse Osmosis Drinking Water Filter System

iSpring RCC7AK 6-Stage Superb Taste High Capacity Under Under Sink Reverse Osmosis Drinking Water Filter System with Alkaline Remineralization - Natural pH, White

When you need an undersink filter that functions through reverse osmosis and can clean and filter your water with a powerful process, look no further than the iSpring RCC7AK 6-Stage Superb Taste High Capacity Under Sink Reverse Osmosis Drinking Water Filter System. This product is a heavy-duty filter that is nevertheless still designed to fit under your kitchen sink and provide you with easy access to clean, fresh water any time you and your family need it. This product can filter up to 99% of many known contaminants, including bacteria, sodium, hard water minerals like calcium and magnesium, chlorine, arsenic, and much more. Whether you’re looking for something to help you deal with heavy metal contaminants or you just want something to make your water taste better, this water filtration system is sure to have everything you need and much more.

Pros

  • Since the reverse osmosis process can remove some beneficial minerals from the water supply, this product includes a final stage that adds these back in and keeps your water healthier and better for you and your family to enjoy. 
  • It’s easy to install this product on your own, and if you have trouble with it, you can contact the company any time to help you with troubleshooting.
  • It only takes a few hours for the tank to be filled initially so you can start enjoying fresher water in almost no time.

Cons

  • Some filters have been known to develop cracks easily inside the filtration canister portions of the product. 
  • Many customers have reported the faucet that comes with this water filter system developing a leak very early on, even when installed correctly and used appropriately.
  • In some cases, the water from this filter has been known to taste a little metallic or sharp.
  • Water Filter #3: iSpring RCC7AK Under Sink Water Filter System

4. iSpring 5-Stage Prestige Top Purity Under Sink Reverse Osmosis Drinking Water Filter System

iSpring RCC7 High Capacity Under Sink 5-Stage Reverse Osmosis Drinking Filtration System and Ultimate Water Softener, White

Sometimes, you need an under sink water filter with a larger capacity for a household with several people in it. Of course, just because you want a bigger filter, that doesn’t necessarily mean you want it to be any more complicated than it has to be! If this sounds like you, then take a look at the iSpring 5-Stage Prestige Top Purity Under Sink Reverse Osmosis Drinking Water Filter System. This product can filter up to 99% of over a thousand types of contaminants including heavy metals, pollutants, chemicals, bacteria, sodium, and much more. And since it’s a reverse osmosis system, it’s a little bit more powerful than some of the others out there, too. With five stages to help your water be as clean as it possibly can be, this water filter is ready to keep your family hydrated in a healthy way.

Pros

  • It only takes a couple of hours to set up this water filter on your own, and you can always contact the company for assistance if necessary during the process. 
  • The water filter comes with its own faucet that fits the filter tubing and is easy to install in your existing kitchen sink as well.
  • This filter is certified in its ability to clean up and filter the water in your home and is designed to function well for years after it is installed.

Cons

  • The canisters housing the filter components have been known to develop cracks and leaks easily on this product, even when it’s used as it should be and installed correctly. 
  • Rarely, some customers have had trouble getting in touch with the iSpring company when they need assistance with this product.
  • Some customers feel that the water from this filter system tastes worse than it does from the tap.
  • Water Filter #4: iSpring Under Sink Water Filter System

5. Aquasans 3-Stage Max Flow Under Sink Water Filter System

Aquasana 3-Stage Max Flow Under Sink Water Filter System with Brushed Nickel Faucet

For an undersink filtration option that offers a fast water flow rate and is easy to install, too, check out the Aquasana 3-Stage Max Flow Under Sink Water Filter System. This product can remove up to 99% of many known contaminants, including chemicals and pesticides, heavy metals, lead, and many others. And since it doesn’t work on reverse osmosis, there’s no need to add anything back into the water when it’s completed its process. Simply filter the water through the three-stage system and enjoy clean, clear, fresh water from your kitchen faucet whenever you need it. This is a small but powerful little water filter system that can be easily hooked up in a short amount of time whether you have previous experience with this type of product installation or not. 

Pros

  • This water filter comes with a new faucet that is specifically designed to work with the tubing and fittings required for the filter system itself. 
  • The product is designed to prevent contaminants from getting back into your water supply as the water filters through the system.
  • Everything that comes into contact with your water in this filter setup is food-safe and lead-free.

Cons

  • Although this product says it comes with a Bluetooth app function, the function doesn’t really do anything to control the filter or maintain any aspect of it, and so many customers feel that the app is fairly useless. 
  • Some customers have reported the filter cartridges and canisters being leaky on installation without any actual use or any damage taking place.
  • In many situations, customers feel that the water that comes out of this filter tastes too much like minerals to be very drinkable, although this is open to interpretation.
  • Water Filter #5: Aquasans Under Sink Water Filter System

6. Epic Smart Shield Under Sink Water Filter System

Epic Smart Shield | Under Sink Water Filter System | Removes 99.99% Contaminants: Lead Chlorine MTBE TTHM Cysts VOCs Pharmaceuticals | Certified Against NSF/ANSI Standard 42,53 & 401 | Made in USA

Choose the Epic Smart Shield Under Sink Water Filter System for your undersink filter needs and you’re sure to enjoy the healthier, tastier water it makes in no time. This is a very small, easy to use and simple to install filter that can remove up to 99% of 70 different contaminants despite its small and compact size. And since it’s smaller, it’s a lot easier to work with for those who have never had an undersink filter or who don’t have a lot of experience with installing these products. All in all, if you’re looking for a great beginner water filter or if you just want something that can clean up the water for a smaller household’s kitchen sink, this product may be perfect for you.

Pros

  • This product can be installed in just a few short minutes without the need for drilling or complicated hookups. 
  • If you have trouble with the installation process, the company offers step-by-step online videos to make it even easier than ever before to figure out just what you need to do.
  • It is possible to get in touch with customer service 24/7 either through email or by phone if you have any questions or concerns about this product.

Cons

  • This is not a very well-known product or a popular brand name, so if you’re looking for something that can be backed by long-term product loyalty, you may want to go with another product. 
  • This water filter causes the water in your faucet to flow much more slowly than it normally would, so it may require a little patience to fill up a larger container with clean water from the sink.
  • Like many other filters of this type, you cannot use this product with hot water or the filter will become damaged beyond the ability to be repaired.
  • Water Filter #6: Epic Under Sink Water Filter System

7. Aquasana 3-Stage Under Sink Water Filter System

Aquasana 3-Stage Under Counter Water Filter System with Brushed Nickel Faucet

For one of the best under sink water filters to use in your kitchen, you may want to consider the Aquasana 3-Stage Under Sink Water Filter System. This filter removes 99% of up to 77 types of contaminants from your water, and it does so without adding anything back that shouldn’t be there or removing anything that should. This product includes a faucet that can be selected from three different finishes so you never have to worry about it matching your sink, and it comes with a set of starter filters so you don’t have to add on the expense of buying filter media right away either. Best of all, it all sets up very quickly and easily, and most customers have no trouble putting it in place without the help of any experts by following the thorough included instructions.

Pros

  •  The included faucet options are all totally lead-free and safe from any contaminants, so you don’t have to worry about your water becoming dirty again after it passes through the filter system. 
  • This product includes a pre-filter to help remove any sediment or dirt that may build up in the water supply and increase the overall flow and capacity of the rest of the system.
  • This product can be used with just about any existing plumbing since it requires very few fittings to work with your kitchen sink.

Cons

  • The O-rings that come as part of this set are not as strong as the ones you may get from a hardware store, so you might want to replace them right away or expect to replace them in a couple of years after they wear out. 
  • The product may decrease the flow rate in your kitchen sink, although not as significantly as some of the other options out there.
  • The filter media housings may leak very easily on this product.
  • Water Filter #7: Aquasana Under Sink Water Filter System

8. iSpring US31 3-Stage Under Sink High Capacity Tankless Drinking Water Filtration System

iSpring WCC31 Water Filters, Blue

If you’re in the market for under sink water filtration that won’t break the bank but will still provide you and your family with plenty of clean water to drink and enjoy, you may be interested in the iSpring US31 3-Stage Under Sink High Capacity Tankless Drinking Water Filtration System. This product is a smaller iSpring filter that functions much like this brand’s larger and more powerful ones without cutting corners in terms of quality and use. It can be installed very easily with or without prior experience, and it includes both a sediment filter and a carbon filter as part of its 3-stage design. This water filter can remove chlorine, chemicals, sediments and more from your water supply and is ideal for use on a municipal water line where you may already have a larger water treatment facility taking care of some of the issues.

Pros

  • The sediment filter that comes with this product is universal, so you don’t have to worry about buying any expensive or hard-to-find replacement filter media to use with this setup. 
  • The product is designed to meet or exceed FDA regulations for food and water safety so you never have to worry about the water you drink becoming contaminated or not being filtered enough for your use.
  • This product is very lightweight and compact despite being a three-stage under sink filter, so you can take it along with you if you move from your home to a different location.

Cons

  • In very rare instances, some customers have reported this product arriving badly broken or damaged right out of the box, or missing several crucial pieces for its installation. 
  • Some customers have had trouble getting in touch with customer service when they have issues with this product.
  • Despite being a smaller product, this filter is not meant for use in trailers or motorhomes.
  • Water Filter #8: US31 Under Sink Water Filtration System

9. iSpring CU-A4 4-Stage Compact High Efficiency Multi-Purpose Drinking Water Filter System

iSpring CU-A4 4-Stage Compact, High Efficiency Under Sink / Inline Drinking Water Filter System for Sink, Refrigerator and RV - Removes Bacteria, Giardia, Lead, Arsenic and much more

The iSpring CU-A4 4-Stage Compact High Efficiency Multi-Purpose Drinking Water Filter System is a high-quality filter that is easy to install but powerful enough to handle even a high-use kitchen sink. This under sink water filter can even be used in other ways such as in your refrigerator if you prefer, so you don’t have to feel limited to only using it with your sink depending on your home’s specific needs. The product is fitted with cartridges that are built for a higher capacity than many of the others out there, so they last longer and don’t have to be replaced as frequently. This helps on your water and electric bill when the system is in use and also helps you save money in the long run on buying filter media, too.

Pros

  • All of the parts of this filter system that come into contact with your water are FDA-compliant and safe for food use, meaning they won’t contaminate your water or lower its quality. 
  • This under sink water filter product doesn’t include a water storage tank and doesn’t produce any wastewater, so it’s a good pick for motorhomes, trailers, and RVs.
  • The filter can remove up to 99% of the most common types of pollutants, like arsenic, lead, heavy metals, and more.

Cons

  • The directions that come with this system may not be as thorough or helpful as some of the others out there, so you may end up needing assistance if you’re inexperienced with this type of installation. 
  • Several customers have had trouble with the water filter causing an oily film on the water it puts out for some time after it has been installed.
  • This product may develop leaks very quickly after installation, even when installed correctly.
  • Water Filter #9: iSpring CU-A4 Drinking Water Filter System

10. Aquasana 2-Stage Under Sink Water Filter System

Aquasana 2-Stage Under Sink Water Filter System with Brushed Nickel Faucet

Choose the Aquasana 2-Stage Under Sink Water Filter System for an under sink water filtration solution that is sure to work great in any smaller setting. This product may not be as large and heavy-duty as some of the other choices on our list, but it is powerful enough to handle the filtration of 99% of 77 of the most common contaminants out there. Made by the well-known Aquasana brand, this two-stage filter utilizes carbon to remove unwanted contaminants without getting rid of the minerals that make your water healthy and good for you to drink. You can easily hook up this product in a short amount of time and get it running in a couple of hours by following the easy included directions or reaching out the company if you have any further questions.

Pros

  • This filter system does not remove magnesium, potassium, or calcium from the water supply, so you don’t have to worry about losing out on these important and healthy minerals. 
  • This is a smaller system, so it’s ideal for apartments, RVs, or households on a water supply that is already partially treated by the city.
  • This water filter is designed to prevent wastewater from making its way back into your water supply.

Cons

  • The water flow in your sink after installing this product is very likely to drop significantly and make it take longer to fill up containers when you need to. 
  • The filter may make your faucet continue to drip water for a little while after the sink has been turned off, even if it doesn’t have a leak.
  • Some customers report this product arriving without any tubing or with no starter filter components, although this is not very common and the company should be willing to work with you to replace any missing pieces with this product.
  • Water Filter #10: Aquasana Under Sink Water Filter System

11. 3M Aqua-Pure Under Sink Water Filtration System

3M Aqua-Pure Under Sink Full Flow Drinking Water Filter System 3MFF100, Sanitary Quick Change, Reduces Particulates, Chlorine Taste and Odor, Cysts, Lead, Select VOCs

Go with the 3M Aqua-Pure Under Sink Water Filtration System for a heavy-duty and very high capacity option that will work in just about situation where you need to filter lots of water for an individual sink. This product is capable of getting rid of bacteria as well as parasites, lead, chlorine, and more from your water supply. Over its lifetime, this filter can handle up to six thousand gallons of water, making it a very long-lasting product that is sure to make a difference in the way you treat the water in your home. Best of all, this under sink water filtration system offers a three-stage design that will ensure your water is as clean and drinkable as possible without leaving behind any unwanted contaminants.

Pros

  • When the time comes to change the filter media inside the product, it’s very easy to do so, and it’s just as easy to find replacement carbon filter media when you need to. 
  • The product can be hooked up to your existing sink and doesn’t require a new faucet in order to work properly, if you don’t want to install one.
  • The product can be used on any sink as long as there is enough space for the filter to sit nearby or underneath it.

Cons

  • The included directions are very difficult to understand and do not explain anything thoroughly enough for anyone who is inexperienced with this type of installation. 
  • The product is very noisy and makes more sound when it filters than most of the other options on our list.
  • The product may slow down your water flow quite a lot and may be inconvenient for anyone looking to fill up a container with water quickly.
  • Water Filter #11: 3M AP Under Sink Water Filtration System

12. Culligan US-EZ-4 EZ-Change Undersink Drinking Water Filtration System

Culligan US-EZ-4 EZ-Change Undersink Drinking Water Filtration System with Dedicated Faucet, Premium 500 Gallon Filter Included

The Culligan US-EZ-4 EZ-Change Undersink Drinking Water Filtration System comes with everything you need to get started filtering your kitchen (or bathroom) sink in no time. This product includes a single-stage filter canister that can be hooked up with simple twist-on fittings and installed without the need for any tools, unless you choose to install with a wrench for tightening the fittings. This undersink filter can remove parasites, mercury, lead, and contaminants that contribute to bad tastes in your water supply as well as many other substances you may want to get rid of. Best of all, with a single filter media, you can filter up to 500 gallons of water before you have to worry about replacing it. All in all, this is a great low-cost option that is especially good for households looking to get started with a water filter system for the first time, or for anyone who needs a smaller and less high-impact filter option for the kitchen sink.

Pros

  • This under sink water filter product is designed to keep the water flow rate in your sink from decreasing too much while the system is in use. 
  • The product comes with one filter media, and replacement media is both easy to find and very affordable, so you don’t have to worry about budgeting a lot of extra funds to replace the filter every few months.
  • One filter is designed to last for about six months unless you use the product a lot more frequently than is common for a kitchen sink.

Cons

  • Some customers report this product developing a slow but steady leak shortly after installation that can, over time, do damage to the cabinets or to the filter canister itself. 
  • It can be very difficult to get in touch with customer service about this product, even if your item arrived without all of the parts required to install it properly.
  • The fitting to connect the filter to the sink is made of plastic and is not nearly as durable or long-lasting as this type of fitting is in other filters.
  • Water Filter #12: Culligan Undersink Drinking Water System

13. Brondell H2O+ Coral UC300 Three-Stage Under Counter Water Filtration System

Brondell H2O+ Coral UC300 Three-Stage under Counter Water Filtration System with LED Faucet

Choose the Brondell H2O+ Coral UC300 Three-Stage Under Counter Water Filtration System to meet all your undersink filtration needs. This product offers a three-stage design that helps filter out up to 99% of many common contaminants in water, including chemicals and lead. These filters are designed to work for up to twelve months without needing to be replaced, depending on how frequently you use your kitchen sink. When the time comes to replace the filter media, all you have to do is twist the canisters off, replace the media in question, and twist them back on again for easy maintenance. Best of all, this product features an LED light to alert you when it’s time to change the filter media, so you never again have to worry that you aren’t taking care of it at the right time.

Pros

  • This undersink water filter product comes with its own faucet that is designed to hook up to the fittings that come with the filter system, making it easier to get everything set up and ready to use in no time. 
  • The product features a sediment filter, a pre-carbon filter, and a traditional carbon filter to help remove as much as possible from your water supply without getting rid of the minerals that are good for you.
  • You can use this product under just about any sink.

Cons

  • The included adapters are flimsy and may not be ideal, so many customers choose to upgrade or replace them before installation. 
  • The product may not filter your water as well as some of the others listed here in the same price range.
  • The product’s replacement filter media may be a little challenging to find.
  • Water Filter #13: Brondell Under Counter Water Filter

14. FS-TFC Reverse Osmosis Water Filtration System

FS-TFC Reverse Osmosis Water Filtration System Under Sink Water Filter 5-Stage 100 GPD Plus Extra Set of 4 Filters for Free (FS-RO-100G-A)

If you’re in need of an under sink water filter that can fit under a smaller sink or even mount to the wall when you don’t have enough room to put it elsewhere, you may need this FS-TFC Reverse Osmosis Water Filtration System. This product is powerful enough to handle any kitchen sink but small enough to work in almost any home, including apartments. It can filter over a thousand different contaminants from your water supply and comes with a beautiful lead-free faucet that is just as easy to install as the rest of the system. This water filter is built to keep your flow rate as high as possible, so you don’t have to sit and wait to fill up a glass of water for several minutes when you just want to drink something healthy and crystal clear.

Pros

  • This filter system comes with lifetime tech support in the event you ever have issues with the installation or upkeep of the product. 
  • This product can handle the filtration of fluoride, unlike many other filters out there.
  • This is a lightweight and compact system that can be moved to another home if need be.

Cons

  • The product does not come with any directions for installation, making it difficult or even impossible for inexperienced customers. 
  • The cartridges may leak very easily on this product.
  • The filter may arrive with broken, damaged, or missing pieces in some instances.
  • Water Filter #14: FS-TFC Water Filtration System

15. NU Aqua Platinum Series Deluxe High Capacity Drinking Water Filter System

NU Aqua Platinum Series Deluxe High Capacity 100GPD 5-Stage Under Sink Reverse Osmosis Ultimate Purifier Drinking Water Filter System - Bonus PPM Meter and Installation DVD

When you’re looking for under sink water filtration with a heavy-duty design and a reverse osmosis option, check out the NU Aqua Platinum Series Deluxe High Capacity Drinking Water Filter System. This product comes with everything you need to get started with a reverse osmosis system right in your own home. It is designed to thoroughly filter your water without reducing the pressure or flow rate in your sink more than is absolutely necessary, and it is capable of filtering over one thousand different contaminants out of your drinking water. To top it all off, this water filter comes with an instructional DVD to help you learn all about how to install it properly, and it even includes a free PPM meter that you can use to test the quality of your water before and after you install the system. Use it to see just what a difference this product will make in your home!

Pros

  • This product features a five-year warranty, which is one of the longest of the products on our list. 
  • The fittings on this product are designed to be screwed into place quickly and easily, making it simple even for inexperienced buyers to use.
  • The product is easy to maintain when the time comes to change the filter media.

Cons

  • This filter has been known to arrive damaged during shipping or missing crucial pieces needed to install it. 
  • The product may develop leaks very early on after it is installed.
  • The valves included with this product may be the wrong size for some sinks, so this can be an additional cost if you need to purchase a replacement before installation.
  • Water Filter #15: NU Aqua Drinking Water Filter System

Under Sink Water Filters: What are they?

best under sink water filter

Under counter filters are so named because of their location – they are usually installed under the kitchen counter, or, in some cases, under the sink. Unlike a countertop filter, where the point of connection is an extra faucet piping option or the faucet itself (through the use of a special lever switch), the under counter water filter usually requires that the whole plumbing system for the kitchen counter be modified. The filter output usually leads to the kitchen tap itself, or a separate faucet for potable water.

Under counter water filters are usually larger than countertop filters, given that it has more space to use under the counter without being in the way. This allows it to handle a larger volume of water.

The Different Kinds of UnderSink Filters

Like many whole-house and countertop filters, under counter filters are modular. However, their modularity depends on how many filters the base unit can accommodate. The simplest ones usually have only one filtering tank, while the most usually have connectors for three or four. If there is enough space, one can even connect post-filtration systems, such as active ionization filters and ultraviolet light emitters.

under sink water filters

The basic filters, though, involve solid-block and granulated filtration tanks. Solid-block tanks are usually made of carbon or ceramic blocks where water is forced through, preventing most particles, including heavy metals and microorganisms from passing through. These filter types can filter down to 0.5 to 1 micron, depending on the way they are made. Granulated filters are usually installed after the solid-block filters, to remove chlorine, fluorine, and other minerals that may pass through the solid-block filter. Some filters can also alkalize the water, or remove odd tastes and smells.

How Do You “Assemble” Your Undersink Water Filter System?

The first thing you should do before installing an under counter filter is to check on the following:

1. Usage Volume
under sink water filter

Under counter filters only make sense cost-wise, if you have a large enough group of people who will need the water volume that an under counter water filter will provide. Do observe how much drinking water is used in a day, and use that as a basis for what kind of water filter system you have to buy.

2. Water treatment needs
under counter reverse osmosis system

Different places have different kinds of water. In some places, the basic treatment of the water may not need filters that will soften the water – that is, remove minerals from it. In other cases, you may need to alkalize the water a bit, given how acidic the natural water source is. It’s a good idea to inquire with the local government offices and with local water experts and neighbors to find out what kinds of filters you will need. From there, you can decide how many filtration tanks you will need for your under counter water filtration system. If the water quality in your area has some unique contaminants, you may even have to spring for special filters that can address those contaminants, specifically. Reverse-osmosis filters may be requires for some metals and chemicals.

3. Acceptable costs
under counter reverse osmosis water filtration system

An under counter water filtration system usually costs about $150 to $250, depending on the filtration systems and throughput that you need. However, you should also take into account installation costs and filter replacements costs as well. Depending on the water quality in your area, you may have to replace your water filters once or twice a year. You should figure all these costs in to see if it’s worth it, or if you can live with a countertop filter, or a water filter pitcher or three.

Under Sink Water Filters: Other Concerns and Installation Tips 

under counter reverse osmosis

Under counter water filters technically can be upgraded, by adding more tank mounts under the counter as you save more money for a more complete filtration system. However, if you can, you should spring for the tank mounting system that is best for your needs at the outset. In other words, if you really do need three or four mounts so that you have three or four filtration tanks to clean your water supply, then you should do that at the outset, and then simply add more of the actual filters as time goes on.

You should also consider that you should have a separate faucet for potable water, as more acidic water is actually good for partial disinfection, such as when you are washing the dishes or when you are taking a bath. Alkaline water may sometimes even encourage some microorganisms to flourish, so having alkalizing filters attached to your main faucet may not be such a good idea.

When installing your under counter water filtration system, it’s important that you do your research, and you plan, so that you won’t spend more than you should, while at the same time give yourself enough leeway to add more filters as needed.

UNDER SINK WATER FILTERS: BONUS VIDEO...

Undersink Water Filter Installation Tutorial

https://www.youtube.com/watch?v=TGiPqcSd_RQ