Best Under Sink Water Filters for 2021

While most people assume that tap water is safe, the reality is that it is exposed to a lot of contaminants within the pipes that find themselves into our homes. Common water contaminants include lead, rust particles, bacteria, pesticides, salts, minerals, organic chemicals, asbestos fibers, and hard metals.

These contaminants expose our bodies to a lot of health risks. Also affected are our home appliances in the kitchen and bathroom, such as washing machines and ice makers which are affected by limescale buildup. Sink aerators may be clogged by sediments in the water, which may affect water flow rate.

Best Water Filter


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Water filtering is the easiest and surest way of dealing with the issue of contaminated water. There are many types of water filters in the market.

Owing to the sensitive nature of water, you should be very careful when selecting the right filter for your needs. Here is the best water filter buying guide.

Under Sink Water Filter | Recommended


Last update on 2021-12-04 / Affiliate links / Images from Amazon Product Advertising API


Under Sink Water Filter | Recommended


Last update on 2021-12-04 / Affiliate links / Images from Amazon Product Advertising API

Home Master TMAFC Artesian

With the Home Master TMAFC Artesian, you have access to an under sink water filter that performs two basic functions. It removes 98% of the contaminants that are within your water, and it also restores magnesium and calcium minerals that are removed during the filtration process.

Through a reverse osmosis system, the majority of the particles and contaminants within your water are removed. As such, the water that comes out of your faucet is extremely clean, making it healthy to drink.

By using the Home Master TMAFC Under Sink Water Filter, your water is even healthier than it was. All of the magnesium and calcium minerals are restored, making the water better for you.

Home Master TMAFC Artesian

Home Master TMAFC Artesian Price

APEC Water Systems ROES-50

The APEC Water Systems ROES-50 is an exceptionally well-designed under sink water filter. It relies on top-of-the-line components and filters that are exceptionally thorough.

A big part of what makes this water filter such a great purchase is its durability. Every component is very well-made, and this allows the filter, and the components that it consists of, to last for a very long time.

Through the use of a reverse osmosis system, this under sink water filter is capable of removing over one-thousand different contaminants. Contaminants such as bacteria, heavy metals, viruses; and many others. Every drop of water is thoroughly clean when it comes out of your faucet.

APEC Water Systems ROES-50

APEC Water Systems ROES-50 Price

iSpring RCC7AK 6-Stage

The iSpring RCC7AK 6-Stage is a six-stage under sink water filter. It relies on a reverse osmosis system that thoroughly cleans your water and removes all contaminants.

What is really nice about the iSpring RCC7AK Under Sink Water Filter is just how easy it is to set up. iSpring walks you through the entire process, and the entire set-up is easy and brief.

Once you’ve set up this filter, water will flow through a six-stage filtration system. Each filter removes a variety of different contaminants and thoroughly cleans the water that passes through it. By the time water has reached your faucet, it is as clean as it can be.

iSpring RCC7AK 6-Stage

iSpring RCC7AK 6-Stage Price

APEC Top Tier vs iSpring RCC7

Factors to consider before buying a water filter

Type of contaminants in your water. Impurities in water differ from area to area. You should be aware of the type of impurities in your area for you to be able to know which type of filter to buy.

Most water suppliers in cities and municipalities publish annual quality reports that contain all the information you may need to know the status of your water.

Alternatively, you may consult the services of a professional tester, or you may purchase water testing kits and do it yourself- make sure you follow all the guidelines. Once you know what to remove, then getting the right water filter becomes easy.

Amount of water you need filtered. If you want to filter water for drinking only, then there is no need of investing in an expensive unit. You may opt for a pitcher or a simple countertop carafe.

However, if you want a large supply of purified water, then you may opt for a whole house system or a faucet-mount filter in the kitchen.

Do you want a permanent or temporary solution? If you are renting a house, then you can only use filters that require little to no installation, such as pitchers, countertops and faucet-mounted filters.

If it is your house, however, then you can make permanent adjustments in your water line.

Maintenance costs and requirements. While the initial cost of most filters may not be very expensive, the challenge is on maintenance.

All filters have a shelf life and have to be replaced regularly. Therefore, do not purchase a water filter that will be too expensive for you.

Best Water Filter Guide

Types of water filters

There are two ways to categorize water filters: (i) by the position they are installed in the house and (ii) by the method they use to filter water.

Based on the position they are installed, we have whole-house filters, showerhead filters, under-the-sink filters, faucet-mount filters, and refrigerator filters. All these faucets purify water in designated areas, with the exception of whole-house filters which cater to the whole house.

We also have water filters that are just appliances that require no installation into the water lines, such as pitchers, carafes and countertop water distillers.

Based on the method they use to purify water, we have the following filters:

Particulate filters reduce particles or sediments, such as sand and rust particles. They are usually kept at the first stage of a multi-stage filtering system.

Activated carbon (AC) filters remove bad taste and smell from water. The carbon chemically bonds with the contaminants to form carbon compounds that neutralize the bad taste and odors.

They are very effective in removing chlorine, radon, herbicides, pesticides and other inorganic chemicals. Some of the best ones also remove lead and mercury.

Reverse osmosis (RO) filters force water molecules through a membrane, and as a result, contaminants such as lead, parasites, and bacteria are trapped behind.

Only impurities larger than water molecules are left behind, which means chlorine and other smaller contaminants can easily pass through the membrane.

Also, beneficial minerals can also be removed by RO filters. However, some filters are designed to restore all the beneficial minerals to the water.

Ion-exchange filters exchange contaminant ions like magnesium, calcium, copper, and zinc with sodium ions that are not harmful to our bodies.

Oxidation Reduction (redox) filters denature the chemical composition of contaminants and convert them into different molecules that are not harmful.

Ultraviolet (UV) filters use ultraviolet rays to destroy bacteria, cysts, and parasites. Unfortunately, these filters do not remove chemicals.

Water Filter Guide

Related Under Sink Water Filter Articles

Buying Guides
Best Under Sink Water Filters

Single Reviews
iSpring RCC7AK 6-Stage
Comparison Articles
APEC Top Tier vs iSpring RCC7

FAQs

Do filters affect the flow rate of water?

Most water filters tend to slow the flow rate because of the purifying process. However, the best units are quite fast and produce moderate to fast water flow rate that you may not be able to tell the difference easily.

A unit that takes too long to filter water will inconvenience you and should be avoided. It is also worth noting that many filters slow down when they approach their shelf life/expiration date.

The only solution would be to change to a new filter.

What if I want to get rid of all impurities?

Filters are designed for different purposes. Therefore, a unit may be effective in getting rid of some contaminants and completely ineffective in others. For instance, UV filters can kill bacteria, but cannot remove chemicals.

The only way you can keep your water free from all contaminants is by installing a multistage filter. It is a system that combines various types of filters. A good example is a whole-house filter which is designed this way.

The multistage is usually installed in the main water line so that all water in the house is purified.

The first purifier is the particulate/sediment pre-filter, which removes particulates and debris. The next phase is the carbon filter, which removes various contaminants and then takes away bad taste and odor of the water.

The next stage involves removing the remaining contaminants, mostly metal-based. Depending on the unit, some may use Reverse Osmosis or Redox filtration.

The next stage involves descaling and water softening. This is where ion exchange filtration takes place.

The Best Water Filters to Buy

Since sodium ions are used to replace magnesium and calcium ions, water becomes salty at this stage. Water softening has to occur at the next stage to give the water its neutral state and taste.

The last stage involves killing the remaining bacteria and germs. Water is then passed through the UV filter, and all the bacteria and microorganisms are destroyed at this point.
However, this stage is optional and will only be included if the water is proven to be highly contaminated with bacteria and microorganisms.

How do I know if the filter is up to standard?

All manufacturers claim their filters are of high quality. However, relying on their word alone is not sufficient.

The filter unit has to pass a quality test from a reputable independent organization, such as NSF and Water Quality Association.

Some people use the EPA approval as a sign of standard, but this is not true. EPA only registers products and does not test quality or approve products. If it has an NSF seal of approval, then it is worth checking it out.

water filter jugs

How do I know when a filter needs to be changed?

Some filters have indicators that keep track of their lifespans. They measure all the water that has been cleaned, and once the maximum amount of water is reached, an indicator will inform you to change the filter.

Our Recommended Under Sink Water Filters


5-Stage Water Filter
6-Stage Water Filter
7-Stage Water Filter
APEC Water Systems ROES-50 Essence Series Top Tier...
iSpring RCC7AK, NSF Certified 75 GPD, 6-Stage...
Home Master TMAFC Artesian Full Contact Undersink...
APEC ROES-50
iSpring RCC7AK
Home Master TMAFC
• Reverse Osmosis
• 50 GDP
• 25 lbs
• 16 x 5 x 18 in
• Reverse Osmosis
• 75 GDP
• 20 lbs
• 15 x 8 x 18 in
• Reverse Osmosis
• 50 GDP
• 14 lbs
• 20 x 16 x 13 in
The ROES-50 reverse osmosis system delivers high quality clean, filtered drinking water at an affordable price. It has been tested and certified by WQA to remove up to 99% of contaminants such as chlorine, taste, odor, VOCs, as well as toxic fluoride, arsenic, lead, nitrates, heavy metals and much more.
With the 6th stage - an Alkaline Remineralization filter, the RCC7AK restores healthy minerals and produces a balanced alkalinity, giving the water a better taste. It uses all natural mineral stones as the filtration media and never sacrifices quality for quantity.
The Home Master TMAFC impresses with its exceptional water purity and added beneficial minerals that produce clean, great-tasting mineral water on tap. Home Master’s innovative design eliminates the most common problems found in traditional RO systems.
5-Stage Water Filter
APEC Water Systems ROES-50 Essence Series Top Tier...
APEC ROES-50
• Reverse Osmosis
• 50 GDP
• 25 lbs
• 16 x 5 x 18 in
The ROES-50 reverse osmosis system delivers high quality clean, filtered drinking water at an affordable price. It has been tested and certified by WQA to remove up to 99% of contaminants such as chlorine, taste, odor, VOCs, as well as toxic fluoride, arsenic, lead, nitrates, heavy metals and much more.
6-Stage Water Filter
iSpring RCC7AK, NSF Certified 75 GPD, 6-Stage...
iSpring RCC7AK
• Reverse Osmosis
• 75 GDP
• 20 lbs
• 15 x 8 x 18 in
With the 6th stage - an Alkaline Remineralization filter, the RCC7AK restores healthy minerals and produces a balanced alkalinity, giving the water a better taste. It uses all natural mineral stones as the filtration media and never sacrifices quality for quantity.
7-Stage Water Filter
Home Master TMAFC Artesian Full Contact Undersink...
Home Master TMAFC
• Reverse Osmosis
• 50 GDP
• 14 lbs
• 20 x 16 x 13 in
The Home Master TMAFC impresses with its exceptional water purity and added beneficial minerals that produce clean, great-tasting mineral water on tap. Home Master’s innovative design eliminates the most common problems found in traditional RO systems.

Last update on 2021-12-04 / Affiliate links / Images from Amazon Product Advertising API


This website is supported by readers. As an Amazon Associate we earn from qualifying purchases.


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About the author

Hi I’m Alexander, founder of HouseholdMe.com and I’d like to say thank you for dropping by. Like most of you, the first thing I look at before buying something online is reviews or buying guides. By reading what other people say will help me gauge whether or not a product is good or not.  I am trying to help people find answers, solve problems, and get inspired.

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