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Best Under Sink Water Filters for 2020-Essential Buying Guide

Water plays a huge role in human life. Without it, neither people, nor plants, nor animals can live. Its purity depends not only on the taste of dishes but also to a large extent on the health of people. Unfortunately, the water that comes to our house from the water supply system requires additional treatment-filtration. If you decide to buy a water filter, you will be surprised at what a wide selection is available in stores. How to make the right choice and don’t waste money?

In this guide, we will give you tips on how to choose the best under sink water filter. We will consider in detail their characteristics, properties, operation features, how it can affect health, and much more.

 

The most popular and effective under counter water filtration systems are:

  • Filtration
  • Reverse osmosis (RO)

Both types of filters have their pros and cons and are designed for different categories of customers, so we have selected some of the best models with one block, three and reverse osmosis systems.

Comparative table of the best under sink water filter models

ImageModelROFilter LifeReduces Lead?Reduces Fluoride?WarrantyPrice
CuZn UC-200 Under Counter Water FilterCuZn UC-200no50,000g or 5 yearsyesyes5 years$
Woder WD-S-8K-DCWoder WD-S-8K-DCno8,480g or 3 yearsyesno1 year$
iSpring CU-A4iSpring CU-A4no1,100g or 6 monthsyesno1 year$$
APEC WFS-1000APEC WFS-1000no1,500g or 1 yearnono1 year$$
APEC ESSENCE ROES-50APEC ESSENCE ROES-50yesup to 4,000-5,000 gyesyes2 years$$$
iSpring RCC7iSpring RCC7yes6 -12 monthsyesyes1 year$$$

Detailed under counter water filtration systems reviews

1. CuZn UC-200 Under Counter Water Filter – The Best Price and Filter Life

CuZn UC-200 Under Counter Water FilterThe Wide Spectrum Model UC-200 by CuZn has a single filtration unit and is intended for installation at home or in the office only for Chlorine Treated Municipal Water. It’s a Long-Lasting system, to filter up to 50,000 gallons of cold water on demand. Designed to connect directly to your existing kitchen sink cold water line.

Features:

  • Lifetime: 50,000 gallons or 5 years, whichever comes first. After, you can just throw the whole thing away
  • 3 stage filtration process: Micro Sediment Membranes, KDF-55 & Coconut Shell Carbon
  • Bacteriostatic filtration system: The UC-200 is Bacteriostatic and Not Susceptible to Mold or Bacteria Growth
  • No third faucet hassle: Connects Directly to your Kitchen Sink’s Cold Water Line. Filtered water is coming from your regular sink faucet
  • Easy Installation: you only need an Adjustable Wrench for Tightening Connections and a few free minutes
  • Kit: filter assembly, brass fittings, and a 3 foot long braided stainless steel water hose
  • Dimensions:5″ tall x 4″ in diameter
  • Made in USA

Efficiency of purification of basic impurities:

The UC-200 utilizes a Micro Sediment Membranes and patented combination of KDF-55 Filtration Media and Virgin Acid Washed Catalytic Coconut Shell Carbon Filtration Media that have been tested to NSF standard 42 and 61.

The manufacturer claims that CuZn UC-200 delays:

  • 98% heavy metals: lead, mercury, chromium VI, cadmium, etc.
  • Over 90% – chlorine
  • Over 90% – pesticides and herbicides
  • Over 90% – VOCs
  • 30-90 % – pharmaceuticals
  • sediment

The UC-200 does not reduce contaminants (chloramine, fluoride, nitrates, nitrites) and microorganisms. That’s why this filter destined for Chlorine Treated Municipal Water.

Warranty:

CuZn Backs The UC-200’s Performance with 5-years Pro-Rated Warranty and carry a 90 Day Satisfaction Guarantee.

Earth Friendly:

Virtually all filtration media are compostable (will biodegrade in compost setting in about 3 years) or recyclable!

PROSCONS
Huge Filter Life Doesn't remove chloramine, fluoride, etc.
Easy to install
Lowest price per gallon
Takes out bad tastes and smells
No drop in water pressure
Eco friendly
Made in USA

Conclusion:

An excellent filter with a huge lifetime, if you are sure that you have a good Chlorine Treated Municipal Water. Also, you do not need to install a separate drinking faucet and change cartridges.

2. Woder WD-S-8K-DC Water Filtration System – The Best Price

Woder WD-S-8K-DCWoder WD-S-8K-DC has a single filtration unit and is designed for installation at home or in the office and should be used in conjunction with municipally treated drinking water or water that has been properly disinfected prior use.

Features:

  • Lifetime: 8,480 gallons or 3 years, whichever comes first. After, you can just change a replacement cartridge
  • Filtration process: filters have a unique technology that removes over 99.99% of contaminants while leaving in all essential minerals. Granular Activated Carbon (GAC) removes many common contaminants.
  • Bacteriostatic filtration system: Woder filter prevents the growth of bacteria and mold
  • No third faucet hassle: Connects Directly to your Kitchen Sink’s Cold Water Line. Filtered water is coming from your regular sink faucet
  • Easy Installation: you only need an Adjustable Wrench for Tightening Connections and a few free minutes
  • Kit: filter assembly, two 18″ lengths of tubing, fittings and screws
  • Dimensions: 16″ tall x 3″ in diameter
  • Made in USA

Efficiency of purification of basic impurities:

The manufacturer claims The Woder WD-S-8K-DC reduces the content of most contaminants:

  • heavy metals: lead (99,9%), mercury, chromium VI, cadmium, etc.
  • Over 99,9% – chlorine
  • VOCs
  • Carcinogens
  • odors and bad tastes

The Woder WD-S-8K-DC does not reduce contaminants (chloramine, fluoride) and any minerals. That’s why this filter destined for municipally treated drinking water or water that has been properly disinfected prior to use.

Warranty:

Woder filters come with a 1-year warranty.

PROSCONS
Inexpensive replacement filtersDoesn't remove chloramine, fluoride, etc.
Easy to installFlow rate decreases significantly after time has passed
Takes out bad tastes and smells
No drop in water pressure
Made in USA

Conclusion:

One of the cheapest offers on the market. If you have good enough water and a little money to buy, then this filter is for you.

3. iSpring CU-A4 4-Stage High Capacity Premium Under Sink Water Filter System – Excellent Quality and Good Price

iSpring CU-A4The iSpring CU-A4 has four filtration units and is designed for installation at home or in the office. This model provides highly effective water filtration for any number of clean-water needs – at the sink, in the refrigerator, for coffee makers and more. iSpring CU-A4 has 0.1 micron Ultra Filtration membrane, which provides much better control of particularly problematic contaminants including bacteria, chloramine, hydrogen sulfide, metals, and other organic compounds.

Features:

  • Lifetime: 1,100 gallons or 6-9 months. UF filter lasts about 12 months. After that, the filter cartridge must be changed
  • 4 stage filtration process: 1st – PP filter with the pore size in 5 microns removes larger particles and solid impurities; 2nd – UF membrane filter with a pore size of 0.1 micron removes infectious microbes; 3rd – 85C granular activated carbon filter + KDF filter removes pesticides and heavy metals; 4th – post-activated carbon filter specializes in absorbing all kinds of organics, hummus, odor, and fouls from the water and improving the water taste
  • Filter Replacement: System Twist On / Twist Off
  • Drinking Faucet: brushed nickel faucet comes with the filter
  • Installation: Filter can stand on the cabinet floor or be screwed to the wall. Also, for installation needs a 1-inch hole in the countertop
  • Kit: filter housing, 4 filter cartridges, drinking faucet, 15 feet of 1/4″ tubing, 3/8″ feed adapter, and Snap-Fit connectors. You can also order Water Alarm, extra mineral stage, Ice Maker Kit, replacement filter set
  • Dimensions:5″ x 4.5″ x 12.5″
  • Made in USA

Efficiency of purification of basic impurities:

The manufacturer claims the iSpring CU-A4 4-Stage reduces the content of most contaminants:

  • Lead, copper, mercury, nickel up to 99%
  • Iron up to 95%
  • Chlorine up to 99%
  • Bacteria, cysts up to 99%
  • Sediment
  • VOCs up to 99%

The iSpring CU-A4 4-Stage does not reduce contaminants (chloramine, fluoride), chromium VI and any minerals (does not affect TDS).

Warranty:

You’ll get a 1-year warranty.

PROSCONS
Good tasting waterDoesn't remove chloramine, fluoride, chromium VI
Remove Iron, BacteriaShort lifetime of cartridges
Easy to change cartridges
No wasted water
Made in USA

Conclusion:

Cool filter in the middle price category perfectly removes bacteria, but do not forget to change the cartridges every 6 months.

4. APEC WFS-1000 Super Capacity 3 Stage Under-Sink Water Filter System – Excellent Quality and Good Lifetime

APEC WFS-1000The APEC WFS-1000 has three filtration units and is designed for installation at home or in the office. This model used to treat tap water, well water and delivers great tasting drinking water at an affordable price.

Features:

  • Lifetime: 1,500 gallons or 12 months. May need to replace filters sooner than 12 months due to heavy sediments and other particles
  • 3 stage filtration process: 1st – 10″ high-capacity polypropylene sediment filter -removes dust, particles, and rust; 2nd – 10″ premium extruded carbon block -gets rid of unpleasant chlorine, tastes, odors, cloudiness and colors; 3rd – 10″ premium extruded carbon block – further removes chlorine, tastes, odors, cloudiness, colors, VOCs and other chemicals
  • Filter Replacement: it is necessary to unscrew the housing and replace the filter
  • Drinking Faucet: 100% Lead-Free chrome faucet comes with the filter
  • Installation: Filter can stand on the cabinet floor or be screwed to the wall. Also, for installation needs a 1-inch hole in the countertop
  • Kit: filter housing, 3 filter cartridges, drinking faucet (with faucet adapter, washers, and nut), feed water adaptor with needle valve kit, 5 feet of 1/4″ food grade tubing, a wrench for opening housing
  • Dimensions: 15″ x 6″ x 12″
  • Made in USA

Efficiency of purification of basic impurities:

The manufacturer claims, The APEC WFS-1000 guaranteeing to remove:

  • Sediment
  • Chlorine
  • Taste
  • Odor
  • Organic contaminants
  • VOCs

The APEC WFS-1000  does not reduce contaminants (chloramine, fluoride), lead or other heavy metals, biological contaminants and any minerals (does not affect TDS).

Warranty:

You’ll get a 1-year warranty.

PROSCONS
Good tasting waterDoesn't remove chloramine, any heavy metals, etc.
High performance
Easy to change cartridges
No wasted water
Made in USA

Conclusion:

A great solution if you do not have the best water quality and a limited budget to buy. Don’t forget to change the filter cartridges once a year.

5. APEC TOP Tier 5- Stage Ultra Safe Reverse Osmosis Drinking Water Filter System (ESSENCE ROES-50) – The Best Water Quality and Good Price

APEC ESSENCE ROES-50The APEC ROES-50 is very popular and inexpensive under sink RO system. It has 5 stages of filtration and produces purified water. APEC Water Systems’ technology guarantees the removal of up to 99% of any water contaminants.

Features:

  • Flow Rate: 50 GPD
  • Lifetime: Stages 1, 2, 3 Pre-Filters – replace every 6-12 months; Stage-4 Membrane – replace every 2-4 years (city water) or every 2 years (Private Well Water); Stage-5 Carbon Filter – replace every 2-4 years (it’s best to replace this filter when replacing the stage-4 membrane)
  • 5 stage filtration process: 1st – Sediment removal filter —removes dust, particles, and rust; 2nd and 3rd – Carbon block filter —gets rid of unpleasant chlorine, tastes, odors, cloudiness and colors. It also removes VOCs and other common chemicals; 4th – High Rejection TFC reverse osmosis membrane. Removes a wide variety of contaminants including arsenic, bacteria, lead, fluoride, chromium, radium and more; 5th – Coconut Shell Refining Carbon 10″ filter removes any possible residual taste from the tank
  • Filter Replacement: it is necessary to unscrew the housing and replace the filter
  • Drinking Faucet: 100% Lead-Free chrome faucet comes with the filter
  • Installation: The RO system can stand in the sink cabinet without mounting.
  • Kit: RO system head with pre-installed membrane, 3 Pre-filters in 3 Housings, storage tank, faucet with washers and nuts, feed water adaptor with needle valve kit, drain saddle, color tubing, tank ball valve, wrenches for opening filter and membrane housing, faucet adapter.
  • System Dimensions: 16″ x 5.25″ x 17.5 “
  • Tank Dimensions: 11″ x 11″ x 15″
  • Made in USA

Efficiency of purification of basic impurities:

The manufacturer claims, The APEC ROES-50 guaranteeing to remove:

  • Chlorine
  • Heavy metals (lead, copper, etc.)
  • Fluoride
  • Bacteria, Ameobic, cysts
  • Organic Contaminants
  • VOCs
  • TDS
  • Taste

Warranty:

You’ll get a 1-year warranty.

PROSCONS
Removes up to 99% of contaminants3 gallons of wasted water per 1 gallon of purified water is average
RO Membrane life of between 2 to 3 yearsNo remineralization stage to add back minerals
4-gallon pre-pressurized water storage tankWater pressure should not be less than 40 psi
Relatively inexpensive among another RO
Made in USA

Conclusion:

Best water quality at a good price and don’t worry about the water quality, now it will be great if you don’t forget to change the filters in time.

6. iSpring RCC7 Under Sink 5-Stage RO Drinking Water Filtration System – The Best Water Filtration System

iSpring RCC7The iSpring RCC7 is one more very popular under sink RO system. This economical, 5-stage, Reverse Osmosis-based filtration systems and point-of-use water softener removes virtually all contaminants from your drinking water, leaving you with pure, clear, clean, great-tasting water.

Features:

  • Flow Rate: 75 GPD
  • Lifetime: Stages 1, 2, 3 Pre-Filters – replace every 6-12 months; Stage-4 RO Membrane – replace every 2-3 years; Stage-5 FT15 Inline Post Carbon Filter – replace every 12 months
  • 5 stage filtration process: 1st – PP Sediment removal filter —removes sediment, dust, sand, and rust; 2nd and 3rd – Carbon block filter —gets rid of unpleasant chlorine, tastes, odors, cloudiness and colors. It also removes VOCs and other common chemicals; 4th – TFC reverse osmosis membrane. Removes a wide variety of contaminants including chlorine, fluoride, arsenic, asbestos, calcium, sodium, and more; 5th – Post Carbon filter removes any possible residual taste and odors from the tank
  • Filter Replacement: it is necessary to unscrew the housing and replace the filter
  • Drinking Faucet: Brushed nickel all-metal faucet comes with the filter
  • Installation: The RO system can stand in the sink cabinet without mounting.
  • Kit: RO Machine Head, RO Membrane, Pre-Filter Housings and Cartridges, Storage Tank, Faucet with Installation Kit, Feed Water Adapter, 4-Color Tubing Set, Drain Saddle ¼”, Tank Valve, Housing Wrenches, Leak Stop Valve, Spare O-Rings and Fittings.
  • System Dimensions: 15,5″ x 8″ x 18 “
  • Tank Dimensions: 11″ x 11″ x 14″
  • Made in USA

Efficiency of purification of basic impurities:

The manufacturer claims, The iSpring RCC7 guaranteeing to removes up to 99% of over 1,000 contaminants, including:

  • Chlorine
  • Heavy metals (lead, copper, etc.)
  • Fluoride
  • Bacteria, Ameobic, cysts
  • Organic Contaminants
  • VOCs
  • TDS
  • Taste

Warranty:

You’ll get a 1-year warranty.

PROSCONS
Removes up to 99% of contaminants2 gallons of wasted water per 1 gallon of purified water is average
RO Membrane life of between 2 to 3 yearsWater pressure should not be less than 45 psi
Ultimate Water Softener
Made in USA

Conclusion:

The Ultimate Water Softener makes water almost perfect for you.

How does an under sink water filter work?

To filter water, it is passed through a filter element that traps impurities and passes clean water. These elements are created from cardboard, nylon or Dacron, cotton, flax, activated carbon and other substances.

The diagram below shows the principle of installing a filter under a sink with a separate drinking tap. If you use a mixer with a built-in tap for drinking water or want to use a CuZn UC-200 or Woder WD-S-8K-DC filter, then you do not need to install a separate drinking faucet.

How does Under Sink Water Filter works

The filtration system is located completely in the space under the sink and is installed on the cabinet floor or be screwed to the wall. The filter is connected to a cold water pipe. Then the water under the influence of pressure in the pipeline is pushed through all the filter elements. They contain pollutants (sand, rust, metals, etc.) and the treated water is fed to the drinking tap.

Filtration or Reverse osmosis? What are the differences?

The reverse osmosis system consists of filter elements similar to conventional filter systems and additionally have a special membrane, the pores of which are so small that they do not pass anything that exceeds the size of the water molecule, which is a significant part of the contamination contained in tap water. Does this mean that reverse osmosis is better than filtration? Let’s compare the two systems.

IndicatorFiltrationReverse osmosis
Efficiency of purificationDoes not completely remove substances up to 0.5-1 micronsCompletely remove substances larger than 0,1 micron
Healthy mineralLeaves healthy minerals (no reduction of TDS)Removes healthy minerals, but the most complex and expensive models can be supplemented with a mineralizer that restores the natural state of water
PriceLow costExpensive
DimensionsIt doesn't take up much spaceTakes up more space. Always included holding tank
Waste waterNo waste water createdFrom 2-4 gallons of water you get 1 gallon of filtered water
ProductivityHigh Low

What to choose?

It depends on what final result you need. Filtration will provide a sufficiently high water output. A smaller amount of purified water, but with a higher degree of purification, will work out reverse osmosis. The financial side of the issue plays an important role. A full-size reverse osmosis unit is quite expensive

Advantages and Disadvantages of Under Sink Water Filters

Under Sink Water Filters are convenient to use, due to the following advantages:

  • Effective removal of pollutants
  • There is a separate tap above the sink
  • The possibility of long-term use of a single set of cartridges
  • Small size and convenient location

Disadvantages of Under Sink Water Filters are:

  • Inconvenience of monitoring the condition of cartridges
  • Quality systems are very expensive
  • Sometimes it is difficult to install the system yourself and you have to invite specialists to install it

How to install under sink water filter system

Installation of each water filtration system has its own characteristics, so before installation, be sure to refer to your instruction manual for a detailed overview of the process.

Review of the installation process under counter water c systems:

Step 1 – checking the completeness of the product

Unpack the filtration system, take out the instructions and check the availability of all parts according to the package. This includes filter housing, filter cartridges, drinking faucet, feed water adapter, color tubing, tank ball, etc.

Step 2 – preparing the tool

To work, we will need an electric drill for drilling holes in the countertop or sink, a wrench for connecting the system to the water supply, a measuring tool (ruler or tape measure) with a marker, etc.

Step 3 – drilling a hole in the sink or countertop

We start by creating a hole in the sink or countertop for the faucet. Make sure that water pipes and other obstacles that may interfere with the installation of the equipment do not pass below the drilling point. At the same time, calculate not only the dimensions of the tap but also the position of the tubes that will fit it from below.

Step 4 – installing a drinking faucet

Install a drinking tap in the hole you have made. Check that the gasket is not skewed.

Step 5-installation of cold water outlet under the filtration system

A separate outlet is mounted on the water supply to connect the cleaning system. It is most convenient to do this before connecting the flexible tubing.

Step 6-assemble the filtration system

Assemble the filter housing, install the cartridges in their places, install all color tubing in accordance with the instructions.

Step 7-connect the filtration system

Place all units of the filtration system under the sink and secure them. Next, connect to the water supply and drinking faucet.

Step 8-check the operation

Open the taps and wait until the system is filled with water. While the water is flowing, carefully inspect all connections for leaks. If they are detected, take appropriate measures to eliminate them.

You can change the order of the installation steps

Next, we have collected videos on installing some of the systems discussed in this review.

How to install a cuzn uc-200 water filter under the sink

How to install under sink water filter system – iSpring RCC7

How to install APEC ESSENCE ROES-50 water filter system

Unboxing of APEC Essence Series Reverse Osmosis Drinking Water System Part 1

How to Insert and Assemble APEC Essence Series RO Filter and Membrane Part 2

How To Install APEC Essence Series RO System Feed Water & Drain Saddle Adapter Part 3

How to Install a APEC Essence Series Reverse Osmosis Drinking Water Faucet Part 4

APEC Essence Series Reverse Osmosis System Tubing Connection Installation Guide Part 5

How often to change water filter in under sink water filter system?

There are two most common questions: “how often do I change the filter?” and “how to replace under sink water filter cartridge?”.

In the review above, we have already noted that filter cartridges periodically require replacement. Most ones must be changed every 6-12 months. This depends on the filter model and the amount and quality of water you filter every day.

Replacing the filter cartridge usually does not take much time. You must unscrew the filter housing, remove the old cartridge, put a new one in and screw the housing back in.

Below we have collected video instructions on how to change the filter in the most popular filtering systems.

How to change APEC Reverse Osmosis (RO) water filter

How to change iSpring Reverse Osmosis (RO) water filter

Under-Sink Water Filtration Quality

Water channels are freely tried by outsiders to guarantee that they sift through the substances and mixes they should. This causes you as a purchaser to recognize the sort of channel that you require for your home. Each water channel under sink is tried to this particular.

The two most basic confirmations accessible for home water filtration gadgets are:

NSF/ANSI 42: Classified as taste and scent, this confirmation principally focuses on the expulsion of chlorine, iron, magnesium, hydrogen sulfides and the adjusting of mineral pH levels.

NSF/ANSI 53: Classified as substantial metals, this confirmation principally focuses on the expulsion of arsenic, asbestos, copper, lead, mercury just as natural and inorganic concoction mixes.

In the event that you live in a region that highlights poor water quality, these propelled channels are for you. Guarantee that they are confirmed to both NSF 42 and 53 norms for the most significant levels of execution and to guarantee they can expel all contaminants including lead and fluoride.

Home Water Usage Profiles

Your normal day by day water utilization figures notwithstanding the degree of comfort you require from your water gadget will decide if an under sink water filter is directly for you or not. Underneath, we’ve given three commonplace use situations with the goal that you can see where you fit.

Low Usage

We would evaluate low use as a family unit of a couple of individuals who devour a normal amount of water every day. What’s more, families which once in a while use filtered water for cooking additionally fit into this user profile. On the off chance that you fit into this classification and worth accommodation, under sink water filters may be directly for you.

Medium Usage

We would measure medium use as a family unit of four individuals, every one of whom drink a reliable measure of water each day notwithstanding normally utilizing filtered water to plan suppers. On the off chance that you fit into this classification, you would be the ideal contender for such a filtering framework.

High Usage

We would evaluate high use as a family of at least four individuals, who require a high performing supply of filtered water for drinking, making refreshments just as the planning of nourishment.

In these occurrences, this kind of water filter is ideal for your user profile and will have the option to proficiently stay aware of your interest as a family unit.

Additional Points for Consideration

There are several other factors that you need to pay attention to before buying a water filtration system for your home.

Water Pressure

Water pressure is an important aspect and determines the level of a comfortable use of water supply systems in the house. Installing any water treatment system will reduce the water pressure in the tap. The amount of reduction will determine the type and model of the filtration system and this must be taken into account before purchasing.

If you initially have low or very high water pressure, then you need to contact specialists who will help you determine the causes and the possibility of increasing or decreasing the pressure.

If you have a low pressure in the pipes and there are no simple solutions to increase it, then it is better to abandon the installation of built-in filtration systems and consider alternative options for providing yourself with quality drinking water – the best alkaline water pitcher or the best countertop water filter system. These systems do not affect the water pressure in your tap.

Maintenance Cost

The continuous support of these frameworks rotates around the intermittent substitution of each filter cartridge. Every cartridge will commonly keep going for a significant timeframe yet the expense of another substitution should even now be mulled over.

No swap filter for this sort of framework is especially costly however they do differ in cost. You will frequently locate that outsider organizations will deliver their own substitution filters which will give you an assortment of practical choices to browse.