Top Under Sink Water Filters Reviewed

under sink water filter reviewIf you test your tap water, you might find some scary ingredients like arsenic, fluoride, hexavalent chromium (think Erin Brockovich), nitrates, plus over 160 other contaminants.

If you have never considered a water filtration, then you may want to consider doing so now as the government allows radiation among other ingredients in our water that we drink, bathe in, wash our dishes in, and wash the clothes we wear.

Let’s start with under sink filtration for drinking water.

Best Under Sink Water Filter

With so many different models of filters available, picking the right one for your family can mean hours and hours of daunting research. To help you save time and cut through the clutter, we present our picks for the best under sink water filters:

1. METPURE Versatile Water Filtration System

METPURE Versatile Water Filtration System review

The MetPure Quick Twist Filter Water Filtration System uses four stages to clean your house’s water. It does so while still allowing for easy installation, operation, and a quick twist filter replacement. This is a low maintenance easy-to-use way to clean your water and ensure your family’s health.

The first step removes rust, dirt, and large sediment compounds. Filter number two uses a composite carbon and PP filter to remove chlorine, tastes, organic compounds, and carbon. The third filter uses reverse osmosis membrane to reduce up to 99% of impurities such as lead, mercury, cysts, and more. Finally, the last filter uses coconut shell granulated carbon to remove any impurities leftover.

Each tube comes with a visible color-coded label to make changing filters even easier. This system uses an NSF certified premium 3.2-gallon metal RO water storage tank for plenty of space to clean water before it comes out of your faucet.

If following the manual proves difficult, the company provides video links to walk you through the installation process. Find everything you need inside the box to set up safe water in your kitchen sink. Includes a 2-year warranty once you register your system.

Metpure Versatile Reverse Osmosis Water Filtration System | 4 Stage Quick Twist Filters RO System With Faucet | Under Sink Water Filter For Clean Drinking Water & Simple Set Up - 50 GPD
28 Reviews
Metpure Versatile Reverse Osmosis Water Filtration System | 4 Stage Quick Twist Filters RO System With Faucet | Under Sink Water Filter For Clean Drinking Water & Simple Set Up - 50 GPD
  • 👍 HIGH QUALITY:- Our high-quality reverse osmosis water filtration system is designed from premium components with the sole purpose of providing perfect water day in day out. Don't settle for subpar water.
  • 👍 EFFECTIVE:- 4 stage filtration system which has been specifically designed to purify your water. Thanks to the state of the art RO Membrane which removes up to 99% of impurities/contaminants from your water such as lead, mercury & chloroform just to name a few as well as 1000s of contaminants.
  • 👍 SLEEK DESIGN:- Our sleek low profile design & mountable design can save you up to 3 times as much space against your typical bulky systems. Each system comes with a 3.2 gallon tank & a 100% lead-free faucet, giving you the complete package, helping you save space, time & money.
  • 👍 NO FUSS MAINTENANCE:- Our quick twist filters & cartridge attachment manifold (CAM) design gives you a frustration-free water filter change & simple system maintenance process. No fuss, no mess, simple & straightforward.
  • 👍 WARRANTY:- Every single one of our systems comes with a full 2 year system warranty: 1 year original warranty + 1 year upon system registration. Any issues what so ever simply drop us an email. No hassle, no catch. Our U.S. based company customer service is always right here to serve you.

2. APEC WFS-1000 Under-Sink Water Filter System

APEC WFS-1000 review

If you need to save space and cut costs try the APEC WFS Filter System. The company is well-known for quality water filtration systems at affordable prices. They make everything right here in America with one year’s guarantee. This particular model is renewed which helps cut down on costs.

With three filtration steps, you can rest assured any dangers will come out of the water and into the filters to provide healthy, tasty water. The set includes a polypropylene sediment filter and two carbon filters. With these steps, the filters remove odor, chlorine, cloudiness, VOCs, dust, rust, and other major particles.

The APEC system does not remove heavy metals like lead or fluoride as it’s designed to remove chemical compounds and sediments. It comes with all the tubing and everything you need to install quickly including a high-quality chrome drinking faucet with pre-drilled holes for your sink. Each tube has an FDA certified JG food grade.

If you encounter any problems, the tech team is ready to help but with a good flow rate and quality parts you shouldn’t find any issues unless you don’t want a chrome faucet in which case find another option. Finally, the three filters do not come visibly labeled so check the packages as you open them.

APEC WFS-1000 Super Capacity Premium Quality 3 Stage Under-Sink Water Filter System (Renewed)
12 Reviews
APEC WFS-1000 Super Capacity Premium Quality 3 Stage Under-Sink Water Filter System (Renewed)
  • Supreme Quality - Designed, engineered and assembled in USA, WFS-1000 offers long-lasting dependable filtration
  • Built with US MADE super capacity filter to treat tap water and well water, providing unlimited refreshing water
  • Comes with 100% Lead-Free chrome faucet, plus FDA certified JG food grade tubing for safe water
  • Backed by life time support from certified WQA water specialist. One year satisfaction guarantee
  • Includes 5 feet food grade tubing & 1/2 to 3/8 inch versatile feed water adapters. Feed Water Pressure: 20-85 psi

3. UV Sterilizer Drinking Water Filter System

UV Sterilizer Drinking Water Filter System< review

The Four-Stage Water Filtration System by Bluonics provides a powerful way to clean your water of tons of contaminants using UV light. The difference between just filters and UV light is the light can kill harmful bacteria, E Coli, viruses, fungi, algae, and more. Even better, the price is even cheaper than the last option!

The three other stages remove pesticides, herbicides, insecticides, trihalomethanes, Benzene, sediments, chlorine, unpleasant tastes and odors along with and many volatile organic compounds. Once run through the system you can safely drink your daily eight glasses of water. The set also includes a dedicated water faucet for easy access.

Everything fits compactly under the sink and each filter has a clear label to replace easily. Order replacement filters easily for years of clean water. Also, the system delivers 1 gallon per minute sufficient for families for drinking and using for cooking without a tank.

Bluonics UV Sterilizer Drinking Water Filter System Ultraviolet Light Under Sink Purifier
13 Reviews
Bluonics UV Sterilizer Drinking Water Filter System Ultraviolet Light Under Sink Purifier
  • Powerful 4 stage water filtration system. This system has an UV light which is excellent to treat harmful Bacteria, E Coli, Viruses Fungi, Algae and many other contaminants
  • The other stages remove Chlorine, Pesticides, Herbicides, Insecticides, Trihalomethanes, Benzene and many volatile organic compounds. Also Sediment, Bad Taste and Odors.
  • Effectively eliminates many impurities from tap water to offer sparkling clean and great tasting water.
  • SAFE: This purifier system is good to treat harmful Bacteria, E.Coli, Viruses Fungi, Algae & Microbes. Environmentally Friendly. No chlorine. Does not change acidic or alkaline water levels, no impact on pH. Used in RV, Boat and mobile homes.
  • Great after sales customer support: 30-day money-back guarantee. Extended manufacturer warranty. Lifetime tech support from Bluonics in Sacramento, California, USA (888) 207-8939

4. Woder 10K-Gen3 Water Filtration System

Woder 10K-Gen3 review

If you have limited space under your sink and want to focus on removing heavy contaminants from your water, try the Woder 10K-Gen3. Their filter lasts for a minimum of 3 years or 10,000 gallons unless you use well water. Also, make sure you use municipally treated drinking water or at least disinfected water before putting through this filter.

The unit comes with direct connect hoses to avoid dealing with plumbing by installing them directly to the existing cold water valve faucet stem under the sink. This also means you don’t need to have a separate faucet for filtered water. Replacing filters is as easy as adding the parts to your filter. With selective filtration, the filters can remove over 99.99% of contaminants but leave all the good stuff like minerals which improve health.

Lastly, this filter removes lead, heavy metals, chlorine, chromium 6, mercury carcinogens, and volatile organic compounds for tasty water without noxious smells. Think about it for a minute, how great would it be to remove all those harmful ingredients and not have to change the filters for three years? If you have a water filter in the fridge, you have to change it every three months!

Woder WD-S-8K-DC Water Filtration System - WQA Certified – USA Made Ultra High Capacity Direct Connect Under Sink Water Filter - Removes Chlorine, Lead, Chromium 6, Heavy Metals, Odors/Contaminants
1,479 Reviews
Woder WD-S-8K-DC Water Filtration System - WQA Certified – USA Made Ultra High Capacity Direct Connect Under Sink Water Filter - Removes Chlorine, Lead, Chromium 6, Heavy Metals, Odors/Contaminants
  • ULTRA HIGH CAPACITY - LASTS FOR A MINIMUM OF 3 YEARS OR 8,480 GALLONS - Notes: For longest life, use with municipal treated cold water only, not well water. Do not use with salty or softened water. Connects for use only with cold water for drinking.
  • USA MADE - NO PLUMBING REQUIRED – Comes with ‘Direct Connect’ hoses that fit standard 3/8” water valves under US kitchen and bathroom sinks. The 3/8” Direct Connect Hose are made to install directly to the existing cold water valve and faucet stem under your sink. Replacement filters ASIN B0144MFN92.
  • WQA GOLD SEAL CERTIFIED to NSF/ANSI 42 for Chlorine, taste, odor and NSF/ANSI 372 for lead free compliance as verified and substantiated by test data. Flow rate 2GPM @65 psig
  • SELECTIVE FILTRATION - Woder filters have a unique technology that removes over 99.99% of contaminants while leaving in all essential minerals (Reverse osmosis filter out everything, including the minerals your body needs. As far as nutrition goes, experts consider it essentially dead water).
  • PURE AND HEALTHY WATER – WITH NO MORE BOTTLES IN THE FRIDGE - Eliminates lead (99.9%), heavy metals, chlorine (99.9%), chromium 6, mercury, volatile organic compounds, carcinogens, and other contaminants, as well as turbidity, odors and bad tastes, so you and your family enjoy pure, healthy, spring-fresh water from the tap.

5. Frizzlife Under Sink Water Filtration System

Frizzlife Under Sink Water Filtration System review

Like the last filter system, the Frizzlife System focuses on removing heavy metals but with a two-stage advanced water purifier with a 0.5-micron filter. A dedicated faucet means you don’t have to wash dishes with filtered water if you would rather save it for cooking and drinking. The stainless steel faucet and filter go in without messing with the plumbing too!

Easy to follow step-by-step instructions walk you through how to mount the filter and hoses in about ten minutes. Filter replacements take even less time and no tools as it is designed with a built-in shut-off valve so you don’t have to shut off the water supply in your garage or basement.

Sometimes, water filters slow down the water flow rate but this one continues strong and can work in multiple places besides under your sink. It comes with a dedicated faucet to slow down your regular cold faucet even less. Use in the bathroom, RV, or even in your bar if your house has a man-cave.

But what does the filter block you ask? First, it gets rid of 99.99% of lead along with chlorine, mercury, rust, heavy metals, carcinogens, and many other nasty things you don’t want rolling around in your stomach. Last of all, this filter lets you keep important minerals like calcium, potassium, sodium, and magnesium.

Frizzlife Under Sink Water Filter-Quick Change Under Counter Drinking Water Filtration System-0.5 Micron High Precise Removes 99.99% Lead, Chlorine, Bad Taste & Odor-With Dedicated Faucet.
819 Reviews
Frizzlife Under Sink Water Filter-Quick Change Under Counter Drinking Water Filtration System-0.5 Micron High Precise Removes 99.99% Lead, Chlorine, Bad Taste & Odor-With Dedicated Faucet.
  • TWO-STAGE ADVANCED WATER PURIFIER WITH 0.5 MICRON: The Frizzlife MP99 Water Filtration System include a TWO-STAGE High precise compound filter, which has a unique technology that removes over 99.99% of contaminants while leaving in all essential minerals. Eliminates LEAD, HEAVY METALS, CHLORINE, CHROMIUM 6, MERCURY, RUST, VOLATILE ORGANIC COMPOUNDS, CARCINOGENS, AND OTHER CONTAMINANTS, SUCH AS TURBIDITY, ORDORS AND BAD TASTES. Enjoy PURE AND HEALTHY WATER From the tap. NO more bottle water!
  • DEDICATED FAUCET & BRASS FEED WATER ADAPTER VALVE INCLUDE: Frizzlife Undersink water filtration system includes a dedicated stailess steel faucet that can installed in most sinks providing cleaner filtered water for cooking or drinking. NO plumbing required, it come with 3/8" compatible brass feed water adapter, brackets and STEP-TO-STEP Installation manual, you can mount the water filter as you wish within 10 minutes.
  • BEST AUTO SHUT OFF DESIGN: Utilizing quick change twist-in installation design makes it take less than 3 minutes for you to install the system or doing a filter replacement. Provides for easy, tool-free, no mess filter replacement. The filter cap is designed with BUILT-IN shut off valve. You don't even need to shut off the water supply whenever you work on the filter cartridge replacement.
  • HIGH FLOW RATE & MULTI-USAGE: Enjoy tap water as pure and healthy as spring water. Tested Full Flow Rate above 1.5GPM @40 psi. Can be used in UNDER SINK, COUNTER TOP,ICE MAKER, BATHROOM, RV, GARDEN, etc.
  • ONLY CORE CARTRIDGE REPLACEMENT: The system contains a core filter cartridge inside the housing, you will only need to replace the core part of the filter cartridge instead of throwing away the whole plastic part, it will save you much money on replacing the cartridge and will do a lot of helps on the environmental protection. Each cartridge with high capacity can be used for 2 years or 1,600 gallon water, for getting better filtration, we would suggest to replace after 6-8 month.

6. CuZn UC-200 Under Counter Water Filter

CuZn UC-200 review

Use the CuZn Water Filter to purify your water for up to 5 years or 50,000 gallons. That’s a lot of drinking water! Note though, this filter system does not work with well water; you must use this system with municipally treated water only. The price is reasonable with tons of happy customers raving about the system.

One reason customers love this system is because you don’t need an extra faucet. This makes installation easier as you only need to connect to your sink’s current cold water line which takes just a few minutes. Grab a wrench to tighten connections and that’s it.

A three-stage filtration process uses micro sediment membranes and coconut shell carbon to purify water while still leaving beneficial minerals for added health. A unique feature of this system is it uses chlorine test strips to detect a chlorine breakthrough. The system is also Bacteriostatic so it won’t grow mold or bacteria which you don’t get with typical carbon only filters.

Further, the system has a huge capacity of 50 gallons for tons of daily use. The UC-200 reduces both organic and inorganic contaminants including chlorine, lead, mercury, chromium VI, cadmium, herbicides, pesticides, sediment, algae, molds, bad taste, odors and other undesirable contaminants affecting the quality of your water supply. The perfect addition to any healthy kitchen.

CuZn UC-200 Under Counter Water Filter - 50K Ultra High Capacity - Made in USA
1,855 Reviews
CuZn UC-200 Under Counter Water Filter - 50K Ultra High Capacity - Made in USA
  • INCREDIBLE CAPACITY/LIFETIME: Up to 5 Years per filter! CuZn Backs The UC-200's Long Lasting Performance with a Comprehensive 5 year Pro-Rated Performance Warranty and 90 day Satisfaction Guarantee. The UC-200 is Designed for use with MUNICIPAL WATER ONLY - DO NOT USE WITH PRIVATE WELL WATER. The UC-200 is a Water Purification System, it is NOT A WATER SOFTENING SYSTEM. The CuZn UC-200 will not resolve issues caused by water being excessively hard (such as lime scale mineral deposits).
  • NO THIRD FAUCET HASSLE & SIMPLE TO INSTALL: Connects Directly to your Kitchen Sink's Cold Water Line. Only Takes a Few Minutes. All You will Need is an Adjustable Wrench for Tightening Connections. NEW Install Video Instructions Available, See Product Description for Details. QUESTIONS or NON-STANDARD Under Counter Plumbing!? Send us an Email or Call CuZn's Customer Support Team @ 800.345.PURE (7873)
  • 3 STAGE FILTRATION PROCESS: Micro Sediment Membranes, KDF-55 & Coconut Shell Carbon. The UC-200's Process Purifies the Water Without Removing Health Beneficial Hardness Minerals, The UC-200 DOES NOT REDUCE TDS READINGS, a PPM or TDS Meter is NOT Effective for testing. To Monitor The UC-200 with Testing, Utilize DPD#1 Chlorine Test Strips and Replace when Chlorine Breakthrough is Detected. Want TDS Removal? Search ASIN# B019N7VG1W on Amazon to View CuZn's Reverse Osmosis System.
  • BACTERIOSTATIC FILTRATION SYSTEM: Unlike Carbon Only Filters, The UC-200 is Bacteriostatic and Not Susceptible to Mold or Bacteria Growth
  • COMPREHENSIVE SUPPORT POLICY: The UC-200 is Fitted with 3/8" Male Compression Inlet/Outlet Fittings & comes with a 36" Long 3/8" x 3/8" Braided Stainless Steel Compression Hose. Have Non-Standard Plumbing or an Alternative Install in Mind (such as dedicated filtered water only faucet)? Contact Customer Support, We'll Supply an Install Kit for All Non-standard Installations at No Additional Cost to You!

7. iSpring RCC7AK 6-Stage Under Sink Filter System

iSpring RCC7AK review

If you want a high capacity reverse osmosis water filtration system, then look no further than the iSpring Filter System. A great choice for crystal clear ice, perfect coffee, or tea, and non-harmful baby formula. The unit provides six stages for water perfection.

It can remove over 1,000 contaminants including fluoride, arsenic, hormones, asbestos, viruses, bacteria, chlorine, and lead all of which you want gone. Because the reverse osmosis removes everything, it makes the water acidic up to a pH of 7.0 or below. To fix the problem, they add a sixth stage which is an alkaline remineralization filter to restore minerals and balance the alkalinity of the water.

The set includes a drinking faucet made of heavy-duty brass with a ceramic disc valve and brushed nickel finish. This works well with the six stages of filtration which are the PP sediment, GAC, CTO, RO membrane, post-carbon, and the pH filter we discussed. All these steps lead to removing problems and adding back in essential elements.

Lastly, the leak-free system offers support videos for the installation process. If you still have problems, call their live support team for assistance. Also, most of the filters last for six to twelve months before you need to replace them.

iSpring RCC7AK 6-Stage Superb Taste High Capacity Under Sink Reverse Osmosis Drinking Water Filter System with Alkaline Remineralization-Natural pH, White
3,365 Reviews
iSpring RCC7AK 6-Stage Superb Taste High Capacity Under Sink Reverse Osmosis Drinking Water Filter System with Alkaline Remineralization-Natural pH, White
  • 6-Stage Alkaline Remineralization Layered Filtration: Exclusively designed to restore the natural alkalinity and mineral balance of water; this reliable and ultra-safe Reverse Osmosis (RO) water filtration system converts your water into clean, pure and healthy drinking water by removing up to 99% of over 1, 000 harmful contaminants like chlorine, fluoride, lead (removes up to 98%), arsenic, asbestos, calcium, sodium and more.
  • BENEFITS: The iSpring RCC7AK water softener includes an additional sixth stage - an Alkaline Remineralization filter which restores healthy minerals and produces a balanced alkalinity, which gives your water a more natural taste than regular 5 stage RO water filter; the RO membrane removes not only harmful pollutants but also a few helpful minerals. As a result, a standard 5 stage RO system produces slightly acidic water with a pH of 7. 0 or below
  • FEATURES: Beautiful European-Style kitchen faucet. Transparent 1st stage housing for easy visual inspection. Three extra long life pre-filters to remove large contaminants and protect RO membrane. Ultra fine (RO) filter to remove contaminants down to 0. 0001 microns; fine GAC filter to provide final polishing to the purified water and (AK) filter to finally restore just the right proportion of healthy minerals and a natural alkaline balance. The end result is great-tasting bottled-water quality
  • EASY DO IT YOURSELF INSTALLATION: The water purifier is designed for do-it-yourself installation and all necessary parts for installation are included, backed by clear, well-organized written instructions, instructional videos, and access to iSpring unparalleled technical support. The entire alkaline water filter fits nicely under a standard kitchen sink. For leak-free installation, simply push tubing ½ inch deep into quick-fitting connectors and lock; no threading pipes needed
  • 100% SATISFIED CUSTOMERS: RCC7AK from America’s favorite brand of under sink water filter is the No. 1 rated reverse osmosis systems in the USA backed by iSpring extended manufacturer upon registration at 123filter DOT com / and lifetime personalized support line 678-261-7611 from Alpharetta, GA, combined with premium quality components, this water filter is to deliver endless bottled quality drinking water right in your home for many years to come, eliminating plastic bottles

8. Express Water Reverse Osmosis Water Filtration System

Express Water Reverse Osmosis Water Filtration System review

The slightly less expensive Express Water System also uses reverse osmosis to remove harmful contaminants from your drinking water but with a few differences. The main change is it does not replace healthy elements with six steps. Some customers want completely clean water and get their minerals from other sources which is fine but just know this model doesn’t replenish the minerals.

Like the other models, installation is a cinch. The easy to follow design makes installation easy to understand especially since the filters each come in a different easy to see color with bold lettering so you always put the right filter in the correct place. This system also includes a large tank to clean your drinking water.

In the first of five purifying stages, the filter clears away sediments. Numbers 2 and 3 use carbon to clean away chlorine, volatile organic chemicals, and odor-causing compounds. The fourth stage cleans up annoying contaminants like lead, fluoride, radium, arsenic, and more. Stage 5 filters out anything left leaving a crisp, delightful flavor without a trace of odor, just the way water should be!

The set may take up more space under your kitchen sink but it comes with its own faucet like many other options. The last and best feature of this system is it comes with an extra set of filters. That means it saves you even more money and you could be set for up to a year.

Express Water Reverse Osmosis Water Filtration System – NSF Certified 5 Stage RO Water Filter System with Faucet and Tank – Under Sink Water Filter – plus 4 Replacement Filters – 50 GPD, Model:RO5DX
1,183 Reviews
Express Water Reverse Osmosis Water Filtration System – NSF Certified 5 Stage RO Water Filter System with Faucet and Tank – Under Sink Water Filter – plus 4 Replacement Filters – 50 GPD, Model:RO5DX
  • Reverse Osmosis Water Filter: Experience what water should taste like with the Express Water reverse osmosis water filtration system removing up to 99. 99% of Lead, Chlorine, Fluoride, Nitrates, Calcium, Arsenic, Bacteria, and more
  • Water Purification System: Drink the healthiest water on Earth. All our water filters are specially engineered to work together, producing the safest and best tasting water you’ll ever drink
  • Under Sink Water Filter: Don’t waste money on professional installation. Express Water’s quick and easy-to-understand design means you can install and understand everything about your new water filtration system
  • Quality : Rest easy with our 1-year on all Express Water Reverse Osmosis Water Systems
  • Under Sink Water Filter System: No need to mess with refilling or activating your water filter, Express Water’s water filtration systems automatically fill your water tank with high quality drinking water

9. NU Aqua Platinum Series Deluxe Water Filter System

NU Aqua Platinum Series Deluxe review

If you have a large family or a constant stream of company, consider purchasing the Nu Aqua Deluxe Water System. Not only does it offer five stages of water purification, but it also produces 100 gallons of water per day with a 4-gallon tank, which is large enough for6 or more family members filling up their water bottles multiple times a day. It uses reverse osmosis with HydraCoil technology for 50% cleaner water than equivalent systems.

The five stages help to remove up to 99% of harmful substances from tap water including, copper, bacteria, viruses, sulfates, cadmium, chlorine, asbestos, barium, fluoride, cyanide, radium, and so much more. This setup does remove important nutrients as well including magnesium, sodium, and potassium. Ensure you and your family have another source of these important minerals.

It works by using three stages to remove particles. The first state removes dirt, rust, and sand. Stage two eliminates rust, sludge, color, pesticides, and odor with a carbon filter. The final stage uses a carbon filter to remove chlorine, heavy metals, and volatile organic compounds. After, the system uses two stages of water polishing. The first to dissolve solids such as salt and the second to remove any bad tastes or odors left.

For families living with low water pressure, the Nu Aqua includes a pre-installed booster pump to increase pressure for better efficiency when filtering. Finally, the system comes easy to install so you don’t need a degree to get it set up under your sink. It even comes with a DVD with step-by-step instructions.

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
204 Reviews
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
  • PREMIUM QUALITY U.S. BRAND: The NU Aqua Platinum Series has gone through rigorous development and testing in our lab to provide consistent great tasting, clean and healthy water on demand. Featuring professional grade high quality quick connect fittings, an elegant NSF 100% lead-free designer faucet to keep your counter top looking great and double o-ring sealed filter housings to provide a guaranteed leak free experience
  • HIGH FLOW RATE: At 100GPD this system doubles the output of standard under sink drinking water filtration systems while increasing contaminant rejection rates and providing a taste superior to bottled water this systems 5 stages ensure the highest standard of drinking water quality unparalleled by pitcher filters or countertop purifiers
  • FREE BONUS INSTALLATION DVD AND PPM METER: Extremely easy do-it-yourself installation can take less than 1 hour with the provided step by step installation DVD or the easy to follow installation manual. Free Bonus PPM meters allows you test easily test your water quality. Color coded tubing, quick connect fittings and simple design allows the system to fit under standard kitchen sinks
  • CUTTING EDGE HYDRACOIL TECHNOLOGY: HydraCoil utilizes a specialty technology manufacturing process for up to 50% cleaner water than comparable systems. Our carbon filters provide a higher absorption rate due to the molecular structure of the pores becoming more permeable which allows even the smallest of particulates to be efficiently removed from your water. This allows the system to provide up to a 99% rejection rate of 1000+ contaminants such as arsenic, chlorine, fluoride, bacteria and lead
  • INDUSTRY LEADING 5 YEAR WARRANTY: Backed by an industry leading 5 year manufacture warranty and lifetime support the NU Aqua Platinum comes with the industries best support and a satisfaction guarantee

10. PureDrop CUW4 Aquacube 4-Stage Water Filter System

PureDrop CUW4 Aquacube review

The Aquacube by PureDrop offers a unique setup for water filtration. All the filters fit snuggly in a white cube for easy placement under your sink. This makes your job so much easier which is a good thing and comes in the middle price range. Works well for a coffee maker, RV, or a bar as well as the kitchen sink.

Stage one removes sediments, dust, sand, dirt, rust, and particles. The next stage eliminates chlorine, tastes, cloudiness, odors, and colors. Stage three gets rid of VOC’s harmful chemicals, chloramine, and other similar substances. The final stage removes bacteria, algae, fungi, giardia, lead, arsenic, iron, nickel, chromium, cadmium, calcium, aluminum, mercury, chlorine, and chlorine treatment by-products, pesticides, hydrogen sulfide along with other organic compounds.

The whole system installs in less than 30 minutes with an integrated water route to reduce install time along with the click on filter setup. The smart filter provides an LED filter change indicator that you just need to press and hold to start. Also, find all the necessary components in the box.

As this is a reverse osmosis system, make sure to get your mineral intake elsewhere. This high capacity water filter includes a faucet for separate use from your regular kitchen sink. Finally, the cube design does not leak to protect your cabinet.

PureDrop CUW4 Aquacube Tankless Drinking Water Filter System Compact Ultra Filtration for Sink, RV, and More, White
77 Reviews
PureDrop CUW4 Aquacube Tankless Drinking Water Filter System Compact Ultra Filtration for Sink, RV, and More, White
  • Cut hassles, not corners with a typical installation time of less than 30 minutes. The unique design of the integrated water route reduces installation time dramatically, and the click-on filter installation ensures easy installation and maintenance.
  • Enjoy safer, healthier, better-tasting water. The superior 4-stage multipurpose water filtration system with its 0. 01 micron Ultra Filtration (UF) stage removes up to 99% of most problematic pollutants, including chlorine and chlorine treatment by-products, lead, arsenic, and much more while retaining healthy minerals.
  • Stay informed on your filter’s status with the integrated LED filter change indicator. Just press and hold both buttons to start.
  • Save space under the counter. The elegant, compact design needs no tank, wastes no water, and provides ultra-quiet operation.
  • Enjoy a faster water flow (0. 32-0. 5 GPM vs 0. 03 GPM with traditional reverse osmosis systems). The unit can be placed under the sink or connected to your refrigerator(ICEK needed).

Questions About Best Under Sink Water Filter

What is a reverse osmosis system?

Reverse osmosis is a form of filtering everything out of water. It can also remove salt from saltwater, treat wastewater, and produce energy. Osmosis works by water passing through a semipermeable membrane that blocks the passage of dissolved solutes (see

The water process causes some controversy as it removes trace minerals which are good for our health (see Of course, you can get minerals from food and other drinks but water with minerals can benefit health greatly. Do some research before deciding which method of water filtration works best for you or you could try one that puts the minerals back in after.

What are volatile organic compounds?

Volatile organic compounds, or VOCs for short, include a large range of synthetic and natural substances including chemical compounds or a mixture of multiple elements including carbon. These substances are considered volatile because they evaporate easily which releases molecules into the air.

Though VOCs are everywhere in life and rarely pose a threat, some of them are harmful including solvents in paints, cleaning products, new plastics, fuels, and more. If these substances aren’t monitored, they can harm not just the air but all living things which is why getting them out of your drinking water is a fabulous idea! (see

Can a water filter help with hard water?

The short answer is no. Hard water comes loaded with a higher mineral content compared to “soft” water which has lower counts of minerals. These make bathing less enjoyable and leave a film on your dishes and can make cleaning your clothes difficult too. Hard water reduces the life span of appliances too.

A water filter removes elements and so does a water softener but a hard water softener exchanges chemical ions to remove unwanted minerals but you need a water filter to get rid of other contaminants. The best solution for areas with hard water is first a water softener and then filter the water for drinking. This way you have the cleanest water for drinking, bathing in, and washing household items. (see

Shouldn’t we have fluoride in our drinking water?

Fluoride in water is an often debated topic. This substance shows up naturally in soil, food, and water. Now, many places synthetically add fluoride to water, toothpaste, and mouthwashes because it is beneficial for teeth as it reduces tooth decay. By adding it to drinking water, fluoride can reduce tooth problems on a larger scale.

Here’s the problem. Too much fluoride can cause dental fluorosis or skeletal fluorosis which damages both joints and bones. These aren’t the only problems for fluoride either. It can also lead to white streaks or specks on tooth enamel. Also, fluoride can cause thyroid problems which can deplete calcium from bones.

The substance causes neurological problems which equate to lower IQ scores and problems learning. Still going, fluoride can cause acne and a few other skin issues, cardiovascular problems, reproductive issues, and possibly lead to ADHD. Do you really want a substance that can lead to heart failure, bone cancer and TMJ in your water?

As stated, fluoride is beneficial for teeth so definitely use a little fluoride toothpaste once or twice a week for tooth health but do not keep it in your water. Notice on your toothpaste it says harmful if swallowed, that’s because of the fluoride. (see

Can I Install An Under Sink Water Filter Myself?

The process is easier than you think. Here is a good YouTube video demonstrating how to install one:

Wrapping Up Best Under Sink Water Filter

The best water filtration systems remove the bad and keep the good substances found in tap water. If you can only pick one option of this list, pick the APEC WFS-1000 Under-Sink Water Filter System as it keeps important minerals necessary for health and also improves the alkalinity of the water too. Since the point of a water filter is to make water healthier, pick the system that keeps the healthy ingredients.

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