Life without water is unimaginable and, when thirsty, we don’t hesitate to fill up a glass at the sink and gulp it down. And do we stop to wonder if it is as clean as we think it is? Probably not. And so, we expose ourselves to microbes and what- not owing to our impure drinking water.

Now you have an option to clean your drinking water with the best under sink water filter to get fresh and natural water. For you guys, I have reviewed 10 filters that will help you in making a choice. So, choose what suits you the best!

The Best Under-Sink Water Filter That Cleans Water Everyday


iSpring RCC7AK Reverse Osmosis

75 gallons/day Best Overall
  • 6-stage filtration
  • Alkaline remineralization
  • Removes 99% contaminants
  • 3.2-gallon tank
  • Leak-free installation

CuZn UC-200 Under Counter

50,000 gallons Best For Long Life
  • Bacteriostatic filtration system
  • Filters 50,000 gallons
  • 3-stage filter system
  • NSF standard

Woder WD-S-8K-DC Under Sink

8480 gallons Best Budget Pick
  • Direct-connect hose
  • Filters 8,480 gallons
  • WQA gold seal certified
  • Removes 99% contaminants

APEC Water Systems RO-90

3 gallons/day Best For Quality
  • WQA tested and certified
  • Removes 99% contaminants
  • FDA certified
  • JG food-grade tubing

1.ISpring RCC7AK Reverse Osmosis

Highlighted Features

  • 6-stage filtration
  • Alkaline remineralization
  • Removes 99% contaminants
  • 2-gallon tank
  • Leak-free installation

iSpring comes with a 6-stage water filter system that removes 99% of the harmful bacteria present in tap water. It consists of a reverse osmosis membrane and works more efficiently than many other RO water filter systems.

Construction: iSpring water filter is constructed of plastic and includes a 3.2-gallon tank that holds the impure water and also has a 2.5-gallon tank for purified water. It comes with a beautiful European lead-free brushed nickel faucet that can be used instead of your regular faucet. Moreover, it has a leak-free installation that makes it easy to install within just a couple of minutes. This water filter includes 4-color tubings and spare fittings & O-rings. It also has a feed water adapter, a drain saddle, and a water detector.

Function: iSpring has a 6 stage alkaline remineralization filter system. It replaces contaminated water with alkaline water and doesn’t remove the minerals. The RO filter system provides clean water free from all the harmful bacteria that reside in tap water. Moreover, this filter system cleans 99% of the harmful contaminants plus removes chlorine, fluoride, arsenic, asbestos, calcium, sodium, giardia, and also removes lead up to 98%, in addition to many more contaminants.

The process through which the water gets purified goes through the pre-filters: the first is a PP sediment filter, second is a carbon KDF(GAC) filter, and the third is a carbon block (CTO) filter. These filters remove harmful contaminants before the water enters into the RO membrane and protect the membrane from contaminants like chlorine and chloramines. At the 6th stage, this filter system remineralizes the water providing you with clean and freshwater. At the last stage, there is a water softening system as well that removes any bitter taste. The water is said to have a 7.0 pH level which makes it neutral.
You can install it without any professional help. For placing and connecting the filter instead of your regular kitchen faucet you can push the tubing a ½ inch deep into the connecters that quickly fit and lock instantly and you don’t need any threads or pipe to secure it.

Cleaning and maintenance: The filters need to be replaced after 2 years and it is a long-lasting filter. Plus, it is cost-effective and eco-friendly as well.


  • Remineralizes the water
  • A 6-stage water filter system
  • Leak-free installation
  • Cost-effective and eco-friendly
  • Removes 99% of harmful contaminants


  • Takes a lot of space under the sink

2.CuZn UC-200 Under Counter

Highlighted Features

  • Bacteriostatic filtration system
  • Filters 50,000 gallons
  • 3-stage filter system
  • NSF standard

CuZn UC-200 comes with an outstanding filter life as it can last up to 5 years and can filter up to 50,000 gallons of water. It also has a bacteriostatic filtration system that doesn’t allow the bacteria to regrow and contaminate the water.

Construction: CuZn UC-200 comes in a small compact size and is made of stainless steel. Moreover, it doesn’t have huge piles of filter hose that might take up a lot of space under your sink. Plus it comes with a connection hose to help you in connecting the filter.

Function: The manufacturer recommends not to attach the filter to a private well line and only attach to the municipal water as it is specially designed for that. The 3-stage filter system consists of a sediment membrane, a KDF-55 filtration media plus a virgin acid washed catalytic coconut shell carbon filtration media which has been tested to NSF standard 42 and NSF standard 61. These filters remove harmful contaminants, in addition to keeping the essential minerals intact. Moreover, the bacteriostatic filtration system doesn’t allow the bacteria to grow and pollute the water.

In order to install this filter under your sink, you have to just connect it to your cold water line and you just need a wrench to tighten the connection. The installation is so easy that it can be done in a couple of minutes.

Cleaning and maintenance: You don’t need to worry about changing the filter often as this filter has a life expectancy of about 5 years and it filters 50,000 gallons of water.


  • Filters 50,000 gallons of water
  • The filters last up to 5 years
  • Has a bacteriostatic filtration system
  • 3-stage filter system
  • Filters harmful contaminants


  • Cannot be used for private well water
  • Doesn’t have a water-softening system

3.Woder WD-S-8K-DC Under Sink

Highlighted Features

  • Direct-connect hose
  • Filters 8,480 gallons
  • WQA gold seal certified
  • Removes 99% contaminants

Woder under sink water filter removes harmful contaminants and provides clean water for drinking. This filter has a compact design that can easily be fitted under your sink without any hassle. The lifespan of this filter is quite long (3 years) which also makes it eco-friendly.

Construction: This compactly designed filter is made of plastic and has connectors at both ends so you can easily attach it to your kitchen sink.

Function: Woder filters 8,480 gallons and removes almost all of the harmful bacteria that are found in tap water. This filter has a long lifespan and if you want to keep it that way then don’t use the filter for non-disinfected water and only use it for municipally treated water. This filter has a gold seal certification from WQA and NSF/ANSI 42 for removal of chlorine and other unpleasant odors or taste and NSF/ANDI 372 for the removal of lead.

For installing this filter you don’t need any plumbing as it can be directly connected to your kitchen sink with its standard ⅜-inch water valve. Although this RO filter removes harmful contaminants but does not remove minerals that are said to be quite essential. It filters lead up to 99.9%, heavy metals, chlorine up to 99.9%, chromium 6, mercury, and others.

Cleaning and maintenance: Due to this filter’s long-lasting life expectancy you don’t need to worry yourself about replacing it quite often as it lasts for about 3 years. Moreover, this filter is eco-friendly and cost-effective as you don’t have to replace it.


  • Long lifespan for about 3 years
  • Easy installation no plumbing needed
  • Eco-friendly and cost-effective
  • Removes 99.9% of harmful contaminants


  • Only filter water that has been disinfected before
  • You can not filter salty or softened water

4. APEC Water Systems RO-90

Highlighted Features

  • WQA tested and certified
  • Removes 99% contaminants
  • FDA certified
  • JG food-grade tubing

Although this filter has an average lifespan, it filters 99% of the harmful contaminants. It is FDA certified and WQA tested and certified as well. It includes a tank that stores the filtered water so that the flow of water is not compromised.

Construction: APEC water filter consists of a 5-stage filtration system and has high capacity filters. It also includes 90 GPD membrane and a post-filter and has a 4-gallon storage pressurized tank, a drain saddle and feed water adapter, JG colored tubing, tank bell valve, JG QC faucet adapter. Moreover, it comes with a lead-free spotless chrome-finish faucet.

Function: APEC water filter removes harmful contaminants through a 5-stage filter system: The first stage filter is made of a polypropylene sediment filter that removes dust so that it protects the lifespan of the membrane. The second and third stages are carbon blocks that filter unpleasant odours, tastes chlorine, VOCs and other chemicals found in water. In the 4th stage is a FILMTEC (DOW chemical) that has a high rejection TFC reverse osmosis membrane. That filters 99% of dissolved solids (TDS) and other harmful contaminants such as lead, fluoride, chromium, bacteria, viruses, etc.

At the 5th stage, there is an advanced coconut shell refining carbon which has the capability to remove any unpleasant taste from the tank. In order to install this filter, you don’t need any professional help as you can easily install it yourself.

Cleaning and maintenance: The APEC under-sink water filter needs to be changed every year. It doesn’t have a long lifespan like the other filters, but its high-efficiency level of filtering water is great.


  • 4-gallon storage tank
  • Filters 99% TDS
  • 5-stage filter to remove contaminants
  • FDA and WQA-certified
  • Comes with food-grade tubing


  • Filters need to be changed every year


5. APEC Top Tier Alkaline 6-Stage

Highlighted Features

  • High capacity filters
  • Lead-free brushed nickel faucet
  • Food-grade colour tubing
  • Calcium alkaline inline filter
  • Water storage tank
  • KitchenFaction Rating

APEC Top Tier filter system has an efficient 6-stage water filtration system. It uses reverse osmosis for water filtration where useful minerals can be added back in the water to improve its taste. Not only this, the pH of the water can be raised to make it more alkaline for people who prefer this kind of taste. This water filtration system has quality construction that would provide long-lasting performance.

Construction: This 6-stage APEC water filter system consists of premium quality water filters that remove 99% of contaminants. The cartridges made of food-grade calcium are US-made. It also comes with a high-quality brushed nickel faucet, a TFC membrane & post filter, a food-grade calcium alkaline inline filter, a water storage tank, drain saddle, high strength housing wrenches, ½-inch or ⅜-inch feed water adapter, tank ball valve and food-grade colour tubing.

Function: The reverse osmosis filtration system effectively gets rid of the contaminants after going through 6 stages. In the first stage, dust, particles, and rust are removed by a high-capacity polypropylene sediment filter. Then in the second and third stages, chlorine, tastes, odours, cloudiness, and colours are primarily got rid of by a carbon block. VOCs and some common chemicals are also eliminated at this stage.

In the fourth stage, 99% of total dissolved solids and many other contaminants such as arsenic, lead, fluoride, chromium, radium, bacteria, viruses, etc. are removed by the TFC reverse osmosis membrane. At the fifth stage, the taste of water is made better by an advanced coconut shell refining carbon filter that removes any unpleasant taste remaining in the water. In the last stage, the alkalinity of the water is increased with the re-mineralizing calcium filter that adds calcium carbonate to the water. Thus, you get better quality, great-tasting water.

Cleaning and maintenance: The filters need to be changed at least once a year. These filters are so designed in such a manner that you can easily maintain and change them. There are clear instructions provided as well for your convenience.


  • Quality construction
  • Multi-stage filtration
  • Remineralization of water
  • Good taste of filtered water
  • Easy to maintain & clean


  • Takes up a lot of space

6. APEC Top Tier 5-Stage Reverse Osmosis

Highlighted Features

  • Super-efficient APEC carbon blocks
  • High-quality pre-filter set
  • TFC membrane or post-filter
  • Lead-free brushed nickel faucet
  • Tank ball valve

APEC Top Tier 5-stage filter system uses reverse osmosis to clean the water. 99% of the contaminants are successfully removed with this technology. There is a 5-stage filtration system that helps in getting rid of arsenic, chlorine, lead, fluoride, heavy metals, bacteria, virus, and 1000+ contaminants. Therefore, you get clean water with great taste.

Construction: The APEC reverse osmosis filter system has a premium quality design and it has been manufactured in the USA. The filters are of superior quality providing durability and long-lasting performance. It includes a high-quality pre-filter set, TFC membrane or post-filter, feed water adapter, drain saddle, housing wrenches, lead-free brushed nickel faucet, tank ball valve, water storage tank and colored tubing.

Function: There is a 5-stage filtration system. At the first stage, the premium quality sediment filter removes dust, particles, and rust. At the second stage, the premium quality carbon block gets rid of chlorine, unpleasant taste, odors, colors, VOC’s and other chemicals. Again at the third stage premium quality carbon block ensures purification by additional removal of odors, bad taste, and residual chemicals.

At the fourth stage, many contaminants like lead, arsenic, fluoride, heavy metals, etc. are removed (99%) by the RO membrane. At the fifth and final stage, refining the coconut carbon filter gets rid of any bad taste or impurities left in the water.

Cleaning and maintenance: The first three filters need to be changed once a year depending on how dirty they are when you change them the first time. Otherwise, you can do it twice or thrice a year. The change of the other two filters can be done as instructed by the manual.


  • Premium quality construction
  • Multi-stage filtration
  • 99% contaminants removed
  • The taste of water is good
  • Lead-free faucet available
  • Easy maintenance and cleanup of filters


  • Takes time to recharge

7. Home Master TMAFC-ERP Reverse Osmosis

Highlighted Features

  • 7-stages of filter
  • Removes 98% of contaminants
  • Non-electric permeate pump
  • Modular filter design

Home Master is an RO filter system and cleans or removes contaminants that are found in water. Plus this filter cleans water in 7 stages.

Construction: Home Master filter comes with a non-electric permeate pump and an under sink reverse osmosis system. It has an innovative design that is an “all in one” modular design. Plus you get a purification unit that is fully assembled and includes the reverse osmosis membrane and the other filters. Moreover, it comes with a storage tank to store filtered water. You also get a feed water adapter that is about ⅜ inches with a shut-off valve. A beautifully constructed chrome faucet is also included in the pack with the RO adaptor and a drain saddle plus you get the instruction manual to help you in installing the device.

Function: This filter cleans water in 7 stages, which cannot be seen in any other RO filters. It removes up to 99% of the harmful contaminants including chlorine, chemicals, heavy metals, and VOCs as well… and many more. The RO system uses the catalytic carbon filtration media that is present in the prefilters to disinfect the chloramine. Other filters do not filter the chlorine completely so this filter does a remarkable job in removing this contaminant. Moreover, you can easily install it in just a couple of minutes.

The other filters have a feature of demineralizing the water but are unable to provide a pure taste of water as it ends up being slightly acidic. Here’s how the degradation of the storage tank happens: the acidic water attacks the rubber bladder and dissolves a small amount of it which leads to a ruined taste of water.

Here’s how this filter works: there is a ‘Full Contact’ remineralization system. Thus the system balances the water’s pH level from two different points of the purification process. This system balances the water’s pH level at two different points of the purification process. The first point of remineralization occurs when the water travels to the storage tank; the second occurs when the water travels to the faucet. At both remineralization points, small amounts of calcium and magnesium minerals (30-60 mg/l combined) are added through a natural process. This helps prevent storage tank degradation and makes the water slightly alkaline, resulting in a cleaner, great-tasting water.

Cleaning and maintenance: The changing of the filter depends upon the condition of water and pressure. Nonetheless, you should change the filters after a year’s usage or after using 2000 gallons of water.


  • Durable construction
  • Easy installation
  • The remineralization process improves water quality
  • The great taste of water
  • Easy to maintain and clean


  • Takes up a lot of space under the sink
  • A bit noisy

8. Frizzlife Under Sink

Highlighted Features

  • 2-stage water filtration
  • Removes lead and chlorine
  • Auto shut-off design
  • 5-micron sediment filter
  • 5-micron block carbon filter

Frizzlife water filter provides you and your family purified filtered water that reaches you after going through 2-stage advanced filtration. The harmful elements are removed and the useful minerals such as calcium, potassium, sodium, and magnesium are retained through the remineralization of water. Hence, you get water that is as good as freshwater. What is more interesting is that you can connect it to your fridge or ice maker quite easily.

Construction: Frizzlife water filtration system consists of 2-stage filtration. The first filter is a sediment filter cartridge with 5-micron precision and the second is a block carbon filter cartridge with 0.5-micron precision. For easy installation, you have ⅜-inch feed water valve, inline water filter system that has the converter fittings of ⅜-inch to ½-inch that can easily be connected to your cold water line of ½-inch and ⅜-inch and a faucet. A shutoff valve has been designed in the filter cap that allows you to change the cartridge without shutting off the water supply.

Function: With the built-in shutoff feature, you don’t have to shut the water supply off. There are 2-stages of advanced filtration. The sediment filter cartridge with 5-micron precision gets rid of different impurities such as sand, silt, and rust from the water. Then, the block carbon filter cartridge with 0.5-micron precision helps in removing 99.99% of lead, chlorine, odor and other leftover particles from the water.

Hence, this filter gets rid of almost 58 contaminants that are generally found in drinking water. Plus, useful minerals such as calcium, potassium, sodium, magnesium, phosphorus, chloride, etc. are retained due to the remineralization process through reverse osmosis technology.

Cleaning and maintenance: You need to change the filter after a year. Also, observe the condition of the water and change it after 3 or 6 months if needed.


  • High-quality filter cartridges
  • No need to shut off the water supply to change filter
  • Removal of a large number of contaminants
  • Water tastes great
  • Easy cleanup and installation


  • Filters need replacement every 6 months

9.APEC WFS-1000 3 Stage

Highlighted Features

  • Super capacity filters
  • FDA certified
  • Lead-free chrome faucet
  • Feed water pressure: 20-85 psi
  • Food grade tubing

APEC WFS-1000 water filter system is an effective 3-stage advanced filtration system that removes a large number of contaminants along with unpleasant odors. Hence, you get purified, filtered water with great taste. The filters are durable and long-lasting and are also FDA certified.

Construction: These premium quality filters have been manufactured in the USA, provide great performance, and are long-lasting. The polypropylene sediment filter is 10 inches and has a high capacity. The same goes for the 2 carbon block filters that are 10 inches and are premium quality filters. You also get a lead-free chrome faucet and food-grade tubing.

Function: The supreme quality filters provide great long-lasting service by filtering your water in a 3-stage advanced filtration process. In the first stage, the sediment filter removes the main contaminants like dust, particles, and rust. In the second stage, the carbon block filter gets rid of any unpleasant taste or odor, chlorine, cloudiness, colours, VOC and some other chemicals. Again, in the third stage, the carbon block filter ensures the removal of any impurities still left including the VOCs, chemicals, chlorine or any bad taste or odor. However, alkalinity and useful minerals are retained at this stage, giving your water a fresh taste.

Cleaning and maintenance: The filters, being US-made, will definitely last a year before you feel the need to change them. You should just take care that the filter is not connected to a hot water source and it is stored in a sheltered place, away from potential weather erosion and sunlight.


  • Premium quality construction
  • Multi-stage filtration
  • Alkalinity and useful minerals remain intact
  • Great, fresh taste of water
  • food-grade tubing for safe usage
  • Easy to clean


  • Not to be connected with the hot water source

10. Express Water Alkaline Under Sink


Highlighted Features

  • 10-stage filtration
  • Double-sealed filters
  • Leak stop valve
  • Brass feed adapter

Express water alkaline water filter is a whole new experience with a 10-stage filtration process. You get an improved, fresh taste of water that would reflect in your drinks like tea and coffee. The easy installation and premium quality make its use convenient. Plus, alkaline water gives you more oxygen and the remineralization process adds useful minerals like calcium, magnesium, potassium, etc. With a large number of contaminants removed with this advanced technology, the quality of your water is definitely upgraded.

Construction: The assembly of 10-stage filtration technology consists of premium quality filters that include the sediment filter, carbon block filter, granular carbon filters, RO membrane, alkaline filter, and a post-activated carbon filter. Each filter has a double seal for protection and to enhance the efficiency of filtration. There is a leak-stop valve that shuts off water flow. A brass feed adapter and a quick connect adapter is also included. Installation is pretty quick. Colour matching labeling of the filters makes the job more convenient.

Function: With this advanced filtration system, you get 50 gallons of filtered water every day. The ten stages of filtration remove a large number of contaminants and make your water fresh and pure. At the first stage, the sediment filter removes dust, particles, and rust. In the second and third stages, carbon block and granular carbon filters remove any unpleasant taste and odor, chlorine, VOC’s and other chemicals.

At the fourth stage, the RO membrane removes lead, arsenic, chromium, fluoride, TDS, radium, etc. from fifth to the ninth stage there is a series of the addition of minerals, antioxidants and minerals to the water by the alkaline filter. There are mineral rocks present at these stages that provide the same experience as that of natural sedimentation. At the last stage, the post-activated carbon filter removes any unpleasant odor or taste from the water that is still left.

Cleaning and maintenance: You need to change sediment, carbon block, and granular activated carbon filters after every 6 months. RO membrane, post-carbon, and alkaline filters need to be replaced after a year.


  • Multistage advanced filtration
  • Protected double-sealed filters
  • Removes a large number of contaminants
  • Remineralization enhances the quality of water
  • Easy maintenance


  • Alkaline filter replacement is a bit difficult

Things To Look For Before Buying!

There are many under-sink water filters and each one of them has a different design and you should know exactly what you are looking for e.g. easy storage, as there are filters that have a compact size and others that are huge and they take a lot of space under a sink.

Therefore, I have listed some questions that can help you in determining which filter is best for you:

  • How much water does it filter?
  • How often should the filters be replaced?
  • How many stages are there to clean water?
  • Does it clean all the contaminants?
  • Does it save space?
  • Is it safe and easy to use and install?
  • Is it eco-friendly?

Buying Guide

What Is An Under Sink Water Filter?

Under-sink water filters are somewhat compactly designed filters that can easily be placed under the sink so that your counter space remains free. Some under-sink filters are of big size and are in need of an attachment against the wall under the sink. However, they can easily be attached to your regular kitchen faucet and voila! a job made easy as you can install it without any professional help. These filters remove the contaminants that are found in water and some filters have a feature of remineralizing the water to keep all the minerals intact that are beneficial to your health.

What Is The Difference Between an and a Countertop Water Filter System?

While both systems use the RO process to clean water efficiently, the major difference that sets the under-sink filter apart from a countertop one is that it takes up less space than countertop filters, as it is tucked away neatly under the sink.

How To Install The Under Sink Filter To Your Kitchen Faucet?

The installation is pretty easy for the ones that come in small compact sizes. They don’t need any tightening or don’t need any threads to secure the filter. The ones that are huge like with the RO membrane and a tank to store water require hard work to install and need to be secured by a thread, and a wrench is needed to secure the valve.

What Is The RO (Reverse Osmosis) Filter?

Reverse osmosis filter is a little different from other filters as it contains pre-filters including carbon filters, sediment filters and some contain even remineralization filters that filter the water from harmful contaminants before the water reaches the membrane so that it isn’t affected. After that, it makes the water drinkable by filtering and improving the quality of the water.

What Are The Advantages And Disadvantages Of Using The Under Sink Filter?

The first and foremost advantage of using the under-sink water filter is that it improves the taste of the water by eliminating that unpleasant taste due to harmful chemicals. Secondly, it improves the quality of water by filtering the water that is full of contaminants. The third advantage that greatly affects the environment is that this filter eliminates the usage of plastic water bottles in your house and allows you to drink fresh, clean and clear water, which makes it environment-friendly.

Another advantage is that the under-sink filter doesn’t take up much space and is hidden under the sink. Moreover, the filters don’t need any high-level maintenance as other filters and the installation is pretty easy and the replacement of filter also varies as some needs filter changes after 5 – 1 year. The only disadvantage this filter has is that it comes with its own faucet that needs to be installed in your kitchen.

How Often Do These Filters Need To Be Changed?

Some need to be changed every 5 years while others need to be changed every year, so it totally depends on the filter, e.g. how it is constructed and how durable it is or whether will it last long or not.

Is Tap Water Dangerous To Drink?

Tap water while traveling to your house picks up harmful contaminants that can be lingering or leaching into the pipes. Or the pipes often get mixed up with the dirty water line and make the water infectious with all the harmful bacteria and contamination that is most certainly not good for health.

Can Contaminated Tap Water Lead To Cancer?

If you are thirsty and desperately in need of water you just walk into your kitchen, take a glass and then fill it with water from the sink, not thinking if it’s clean or free of contaminants. I have news for you guys regarding the contaminants found in tap water that can lead to cancer and is dangerous for human health.

Can Lead Also Contaminate Tap Water?

Not knowing what material the underground pipelines are made of? Well, if they are of lead and they haven’t been replaced in a long time then particles by particles, lead can get into the running water, thereby contaminating it. You need to be careful and take precautionary measures to avoid this contamination from getting into your system as it can’t be good for your health.


So the best product I came across is the iSpring one which comes with a 6-stage water filter system and removes 99% of the harmful bacteria present in the tap water. It consists of a reverse osmosis membrane and works more efficiently than many other RO water filter systems. Now, it’s up to you to make the choice by choosing the best under-counter water filter that fits your needs and efficiently filters your water. So, make the change and switch to clean and clear water to keep your life healthy.