10 Best Under Counter Water Filters Reviewed as of March 2023

Reviews Scanned

Sale1

Waterdrop 15UA Under Sink Water Filter System, Reduces Lead, Chlorine, Bad Taste & Odor, Under Counter Water Filter Direct Connect to Kitchen Faucet, NSF/ANSI 42 Certified, 16000 Gallons, USA Tech

Ultra-Long Service Life: When used with municipal water, each filter has a maximum service life of 24 months or 16,000 gallons.[1]
Innovative Multistage Filtration: The Waterdrop Direct Connect Under Sink Water Filter System uses innovative multistage filtration. And it can effectively reduces lead, chlorine, heavy metals, chemical iṁpurity, sediment and other large particles.[2] Enjoy healthy and pure water straight from your tap – no need to buy bottled water anymore!
WQA Certified Filter: Made from premium BPA-free and lead-free materials, the under sink water filter is certified by WQA against NSF/ANSI 372 Standard, ensuring reliable use from inside to outside. Certified by WQA against NSF/ANSI 42 Standard, the water filter can effectively reduce chlorine, taste and odor. Tested by third party laboratory against NSF/ANSI 53 standard it can reduce lead. To look over the 42&372 certification, please search "WD-15UA" on WQA official website.
Easy Installation: The system should be connected only to a cold water supply. With innovative push-to-connect fittings, the entire installation process takes less than 3 minutes. The twist-and-lock design ensures that you can replace the filter in 3 seconds. The system includes a 3/8” hose with a direct connection that adapts to standard 3/8’’ feed water valves under US sinks. The 3/8’’–1/2’’ convertor fitting helps you connect the system to both 1/2’’ and 3/8’’ cold water lines and faucets.
Fast Flow Rate & Multiple Uses: The fast and stable water supply provides pure and fresh water that tastes like spring water. The tested full flow rate is 0.75 gpm at 60 psi. Developed for household and commercial use, the Under Sink Water Filter System can be installed in your kitchen, bathroom, RV, or office to meet your daily water needs. Ideal for drinking, cooking, skincare, and cleaning.

Sale2

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

Incredible Capacity and Lifespan, Up to 5 Years per Filter; CuZn Backs the UC-200’s Long Lasting Performance With a Comprehensive 5 Year Prorated Performance Warranty, CuZn Will Provide Warranty Replacement if Early Expiration Occurs; the UC-200 Is for Municipal Water Only; Do Not Use With Private Well Water; the UC-200 Is a Water Purifier, the UC-200 Does Not Soften Water; the UC-200 Will Not Resolve Issues Caused by Excessively Hard Water Like Lime Scale Mineral Deposits on Tea Kettles
Simple to Install; The UC-200 is Designed for Direct Connect to the main Kitchen Sink Cold Water Line; No Drilling Through the Countertop to Mount an Extra Filter Dispenser Faucet Required; How to Install Video Tutorial Instructions Available; If You Have Non-Standard Under Counter Plumbing Connection Issues or Are Unable To Complete Installation, CuZn Technical Support Will Diagnose and Provide All Additional Adapters Required To Complete Your Installation
3 Stage Filtration Process Utilizing Micro Sediment Membranes, KDF-55 and Coconut Shell Carbon; the UC-200 Will Not Reduce TDS or PPM Type Meter Readings; if TDS or PPM Removal Is Desired, a Reverse Osmosis Type Filter System is Required; the UC-200 Is Designed To Purify Water Without Reducing the Health Beneficial Mineral Content and as a Result the TDS or PPM Type Meter Readings Will Show the Same Results When Measuring the UC-200’s Filtered Water and the Unfiltered
Bacteriostatic; Unlike Carbon Only Filters, the UC-200 Is Bacteriostatic and Not Susceptible to Mold or Bacteria Growth; To Test the UC-200’s Filtered Water To Confirm if the Filter Is Still Working, Utilize DPD#1 Chlorine Test Strips and Replace the UC-200 When Chlorine Is Detected in the Filtered Water; Sensitive Test Strips That Test Down 0.25 or 0.5ppm Are Ideal for Earliest Possible Detection of Chlorine; Early Expiration Prior to 5 Years Use Is Covered Under Warranty by CuZn
CuZn’s Comprehensive Install Insurance Policy Is Included With Purchase of the UC-200 on Amazon; if You Are Unable To Complete Your Installation for Any Reason; Or You Have an Alternative Method for Installing the Filter In Mind Such As Connecting the UC-200 to a Dedicated Filtered Water Only Dispenser Faucet Purchased Separately; Simply Use Amazon Buyer-Seller Messaging To Send Us Your Request and CuZn Tech Support Will Diagnose and Provide the Necessary Alternative Install Kit on the House

Waterdrop Reverse Osmosis System Countertop, 4-Stage Countertop RO Water Filter System, Countertop Water Filtration System, 3:1 Pure to Drain, BPA Free, No Installation Required, WD-K19-S

[𝗖𝗼𝗻𝘃𝗲𝗻𝗶𝗲𝗻𝘁 𝘁𝗼 𝗨𝘀𝗲] This countertop RO water filter system K19 is ready to use as soon as it’s turned on, with no plumbing or drilling required. Because of its compact size of 13.8*7.9*16.3 inches, this countertop reverse osmosis system can be placed in your living room, bedroom, RV or anywhere you want, thanks to its compact size.
[𝟯:𝟭 𝗽𝘂𝗿𝗲 𝘁𝗼 𝗱𝗿𝗮𝗶𝗻 𝗿𝗮𝘁𝗶𝗼] Thanks to the advanced waste water circulation technology, this K19 countertop water filter system has the pure to drain ratio of 3:1, which means that making 3 cups of filtered water produces only one cup of waste water. This makes it a more economical choice. 💧Note: If the system displays L1, it means that the TDS level of water is too high, and please pour out remaining water in the tank before refilling it with new water.
[𝟰-𝘀𝘁𝗮𝗴𝗲 𝗙𝗶𝗹𝘁𝗿𝗮𝘁𝗶𝗼𝗻] The 4-stage composite filter of the countertop reverse osmosis system can reduce most contaminants such as TDS, heavy metals, etc. Through PP cotton, activated carbon, reserve osmosis and UV light, this K19 countertop RO water filter system can achieve the excellent filtration effect to provide healthy water for you and your family. 💧NOTE: Do not work with well water or source water with high TDS (>500).
[𝟭𝟳𝟬 𝗼𝘇 𝗛𝗶𝗴𝗵 𝗖𝗮𝗽𝗮𝗰𝗶𝘁𝘆] Through the ergonomic design, the water tank of the countertop RO water filter system is easy to fill with water. Although the water tank is compact, it has the high capacity of 170 oz and can meet water demands of a big family for a whole day. In order to increase the utilization rate of water, please fill the feed water tank to the Max mark every time.
[𝗦𝗺𝗮𝗿𝘁 𝗗𝗶𝘀𝗽𝗹𝗮𝘆] This K19 countertop RO water filter system will start the automatic flushing mode after being powered on for the first time. Its smart display screen allows you to check the filter state, TDS level, preset water volume and more easily. Its highly-sensitive touch design makes it more convenient to operate.

Sale4

Waterdrop TSA 3-Stage Under Sink Water Filter, Water Filtration System Under Sink System, Direct Connect to Home Faucet, NSF/ANSI 42 Certified Element, USA Tech

[More filters, better taste] This under sink water filter system comes with 3 filters and can realize 8-stage deep filtration to reduce silt, rust, cyst, residual chlorine, lead, heavy metals, etc. Its KDF materials can effectively reduce bäcteriä and heavy metals. Its resin reduces fluorides. This filter has passed WQA certification to reduce residual chlorine and improve taste, thereby ensuring every drop is pure and healthy. It also can retain minerals, but cannot reduce TDS.
[No leaking or cracking with highly precised technique] The under counter water filter adopts strong materials with an upgraded design. In addition, the age-resistant and freeze-resistant materials make the system twice thicker. The under counter water filter system for kitchen has also passed 400 psi burst pressure, 100,000+ pulse tests at 150 psi, and static tests at 300 psi. These tests prove that the durable integral design clears up worries about cracking cases and leaking issue.
[Lifespan of up to 18 months] The three under sink water filters have lifespans of 6 months, 8-12 months, and 12-18 months, respectively. This long lifespan eliminates the cost of purchasing and replacing filters every now and then. Under the premise of meeting the needs of a family of five at a go, the average daily cost is only 0.24 dollars. We help you save over 60% cost compared to buying bottled water.
[3min installation, 3s replacement] This under sink water filter system works perfectly with 3/8” and 1/2” cold water tubes. The under counter water filter is a simple DIY. With innovative push-to-connect fittings, the installation takes less than 3 minutes. In addition, the twist-and-lock design lets you replace each filter in just 3 seconds.
[On-demand filtration solution] The Waterdrop under sink water filter for drinking water connects to your original faucet, so that you don’t have to drill a hole. With a stale water flow, this under sink water filter provides all-round protection for drinking or usage.If you have any problems with the product, contact our 24/7 technical support without any worry!

Sale5

Waterdrop G3 Reverse Osmosis System, NSF Certified, Tankless RO Water Filter System, Under Sink RO System, TDS Reduction, 400 GPD, Smart LED Faucet, UL Listed Power, FCC Listed, USA Tech

[Trusted Certification] The Waterdrop reverse osmosis system is certified against NSF 58 for TDS reduction and NSF 372 certified for lead-free material. The TDS removal rate of the RO system is certified to be up to 91.9%, and the hexavalent chromium reduction rate is certified to be up to 96.9%. The tankless reverse osmosis system is also certified by the Federal Communications Commission. Besides, it won German Red Dot Design Award 2019 and meets the EU Standards and UKCA Standards for safety.
[8-stage Filtration] Tested by official third-party laboratory (SGS), the RO system can effectively reduce TDS, chromium, pfas, fluoride, arsenic salt, iron, radium nitrate, calcium, particles, chloride, chlorine and heavy metals like hexavalent chromium in your tap water. And our RO system can reduce toxic chemicals such as vinyl chloride, ethylhexyl acrylate, isobutylene, ethylene glycol, monobutyl ether, according to the reverse osmosis membrane technical manual.
[Smart display faucet] The reverse osmosis water filtration system is built with a smart display faucet. For instance, the TDS monitor tells you the quality of your filtered water, while the filter life tracker shows how soon you need to replace your filter. So now you can enjoy an improved water-using experience and a convenient lifestyle.
[400 GPD＆1:1 pure to drain ratio] The RO system offers faster water flow (400 gallons per day) and can filter a cup of water in about 12 seconds. Compared to traditional RO systems, the Waterdrop RO System has a low drain ratio of 1:1 and saves water waste by 300%. Save more money on your water bills!
[Special Notice]: You must fully turn on the faucet and flush the RO system for 30 minutes after installation. The total water capacity will be about 8. 5 gallons and the water will be undrinkable during flushing. And we highly recommend using the Waterdrop authentic RO faucet as other brands may not be compatible with your system. If you have any doubts, please reach out to our customer service before buying.

Sale6

Waterdrop 10UA Under Sink Water Filter System, Reduces Lead, Chlorine, Bad Taste & Odor, Under Counter Water Filter Direct Connect to Kitchen Faucet, NSF/ANSI 42 Certified, 8K Gallons, USA Tech

Less than ＄25.99 per replacement filter (Search " B085G66JTZ "on Amazon), save over 50% of cost on subsequent use.
[After Sales Assistance] Waterdrop Backs the WD-10UA's high-end technical performance with a comprehensive prorated performance service; should a quality issue arise with the filter, you can contact us.
[Deep Filtration and WQA Certified] Based on independent testing, this filter can efficiently remove large-particle contaminants such as rust, lead, chlorine, heavy metals, chemical impurities, and sand through thorough purification for clean drinking water. The filter is made of high BPA-free and lead-free materials and is certified by WQA against NSF/ANSI 372 Standard. The water filter has been certified by WQA under NSF/ANSI 42 Standard and can successfully reduce chlorine, taste, and odor. It can lower lead when tested by a third-party laboratory against NSF/ANSI 53 standards. Please use the "WD-10UA" search term to review the 42&372 certification on the WQA website.
[Innovative Design] Only a cold-water source should be used to power the filter. Its twist-and-lock construction and push-to-connect fittings enable installation in three minutes, three second replacement, and safety-assuring integration. This filter comes with a 3/8" line that connects directly to US sinks' standard 3/8" feed water valves. The system is connected to 1/2" and 3/8" cold water pipes and faucets with the use of the 3/8"-1/2" convertor fitting.
[Filter Replacement and Long Lifespan] This filter system may be upgraded with a UF filter or a MZ filter to meet your water needs. It is compatible with several filters with various functions. Each filter system has a maximum service life of 12 months or 8k gallons when used with municipal water, which is sufficient to cover the needs of an entire household.

Sale7

Waterdrop TSU 0.01μm Ultra-Filtration Under Sink Water Filter System, 3-Stage High Capacity, USA Tech, Smart Panel, No Waste Water, 2 Years Lifetime

𝟎.𝟎𝟏 𝐮𝐦 𝐮𝐥𝐭𝐫𝐚𝐟𝐢𝐥𝐭𝐫𝐚𝐭𝐢𝐨𝐧 𝐦𝐞𝐦𝐛𝐫𝐚𝐧𝐞: The 0.01 um ultrafiltration membrane can reduce most harmful substances that are larger than 0.01 um. The integrated-waterway under sink water filter system can effectively reduce residual chlorine, taste and odor, heavy metals and prevent leakage. Please note that Waterdrop under sink water filter can retain potassium, calcium, sodium, magnesium and other minerals that are beneficial to health, but it cannot reduce the TDS.
𝐈𝐧𝐭𝐞𝐠𝐫𝐚𝐭𝐞𝐝 𝐰𝐚𝐭𝐞𝐫𝐰𝐚𝐲𝐬: This Waterdrop under sink water filter system adopts advanced integrated waterways to prevent water leakage, so that you can feel free to replace the filter without shutting off water supply. The under sink water filter can give you a safe water drinking experience.
𝟐𝟒 𝐦𝐨𝐧𝐭𝐡 𝐟𝐢𝐥𝐭𝐞𝐫 𝐥𝐢𝐟𝐞𝐬𝐩𝐚𝐧: With the adoption of the advanced ultrafiltration membrane design, the service life of the under sink water filter system is prolonged to 24 months, the replacement frequency is reduced, and the maintenance cost is saved. Besides, the lifespan of the PP filter is 6 months, and the lifespan of the CT filter is 12 months.
𝐒𝐦𝐚𝐫𝐭 𝐢𝐧𝐝𝐢𝐜𝐚𝐭𝐨𝐫𝐬: The under sink water filtration system is provided with smart indicators, which help to improve the life quality, so that you can get the water quality and work modes at a glance. The indicators on the panel notify you when to replace the filter, ensuring purity and safety of drinking water.
𝐄𝐚𝐬𝐲 𝐭𝐨 𝐢𝐧𝐬𝐭𝐚𝐥𝐥: The system is equipped with a stainless steel faucet, a 3/8” water inlet hose, a 1/4” water outlet hose, a 3/8”-1/2” feed water adapter, and other necessary accessories. You can install this Waterdrop Ultra Filtration System in a few minutes, and its filter can be easily replace by simple twist and pull within 3 seconds. Please note that you need to drill a 1-inch hole on your countertop.

Waterdrop Countertop Reverse Osmosis System, 4-Stage Countertop Water Filtration, Countertop RO Water Filter System, 3:1 Pure to Drain, BPA Free, No Installation Required, WD-N1-W

💧 𝐒𝐆𝐒 𝐓𝐞𝐬𝐭𝐞𝐝 𝐚𝐧𝐝 𝐂𝐞𝐫𝐭𝐢𝐟𝐢𝐞𝐝: According to GB/T 5750.4-2006 and EPA 537 standards and by referring to NSF/ANSI 42&53&58 standards, the filter can reduce over 99.99% of escherichiä cöli, 98% of TDS, over 99% of chromium, over 99% of PFOA/PFOS, 98% of fluoride, over 99% of lead, over 99% of arsenic, over 99% of mercury and 96% of nitrate.
𝐏𝐥𝐮𝐠 𝐚𝐧𝐝 𝐮𝐬𝐞: Our N1 countertop RO system is installation-free and no drilling required. All it needs is a socket and you can have pure water anywhere, from the bedroom to your office. The countertop water filtration system is an excellent choice for renters as there is no need to drill a hole on your countertop. NOTE: An electrical outlet is required to operate the RO system, and the machine wire is 70.87 inches.
𝟓-𝐢𝐧-𝟏 𝐢𝐧𝐭𝐞𝐥𝐥𝐢𝐠𝐞𝐧𝐭 𝐟𝐮𝐧𝐜𝐭𝐢𝐨𝐧𝐬: The countertop water filtration system can monitor your water’s condition intelligently with a smart screen displaying level of Total-Dissolved Solids (TDS), filter life indicator, volume settings, water shortage alerts, and an auto-flush mode. 💧NOTE: Do not work with well water or source water with high TDS (>500).
𝐄𝐜𝐨𝐧𝐨𝐦𝐢𝐜𝐚𝐥 𝐜𝐡𝐨𝐢𝐜𝐞: The countertop reverse osmosis system reduces wastage with its impressive 3:1 drain ratio and drain water recycling technology, so you won't waste much water. The water filter system countertop also enters power-saving mode when idle, reducing power consumption and saving electricity. Save water, money, and the planet!
𝐁𝐮𝐢𝐥𝐭 𝐟𝐨𝐫 𝐜𝐨𝐧𝐯𝐞𝐧𝐢𝐞𝐧𝐜𝐞: 1) Maintaining our countertop RO is effortless. Its 135 oz tank ensures you’d seldom need to refill it. 2) The N1 water filter system countertop enters automatic flushing mode after the first power-on. Since the filter cartridges have been activated, they can work efficiently to achieve optimal filtration performance. 3) The CF filter of the countertop water filtration system features a 6-month lifespan and the MRO filter can last up to 18 months.

7 Healthy Water Options: 4 ionized alkaline continuously variable; 1 non-ionized purified; 2 ionized acidic presets.
Advanced 7-Electroplate Technology: 7 platinum coated titanium, long-life, durable, energy-efficient plates.
Built-in Active Carbon Water Filter: Long-life, hi-tech filter purifies over 1,585 gal. of water and last up to a year.
Self-Cleaning: Unit cleans itself by reversing polarity after each use and auto-plate washing itself every 10.5 gal
Additional Features: Fully variable 4.5 to 11 pH; OPR Range +600 to -750mV; intuitive backlit LCD, 5-year warranty.

Waterdrop TST-UF 0.01μm Ultra-Filtration Under Sink Water Filter, Stainless Steel Water Filter for Sink, 5X Service Life, 99.99% of Contaminants Larger than 0.01μm, USA Tech (3 Filter Included)

Selected materials: Made from lead-free 304 stainless steel, the under counter water filter is resistant to corrosion and compression. The 0.01 μm ultra-filtration under sink water filter system is durable, strong, and less prone to cracking, thanks to minimal lead and cadmium content. Its thick sealing ring in the cap prevents leakage.
Efficient filtration: This Waterdrop under sink stainless steel water filter has 6 layers of premium filtration materials. The 0.01 μm precise ultrafiltration membrane reduces most harmful substances larger than 0.01 μm. The activated carbon block and PP cotton effectively reduce chlorine, heavy metals, chemicals, cyst, odor, rust, and large particles in your water, while improving the water taste.
Recyclable housing: The recyclable housing design of the stainless steel water filter system reflects our commitment to protecting the environment. You don’t need to replace the stainless-steel housing. Once the filter expires, just replace the inner filter and that’s all. PP filter lasts 6-8 Mths, UF filter lasts 12 Mths and CT filter lasts 12-24 Mths, which may vary based on local water quality. The longer its lifespan is, the less frequent the filter needs replacing, which helps save money.
Faster water flow and easy installation: The under sink water filter has the flow rate as high as 1.59 GPM, which means you can fill up an 8 oz cup of water in just 2.3 seconds. The water flow remains stable even at a high speed. The innovative design of this under sink water filter system means you can install without drilling a hole on the countertop. You can connect the system directly to your home faucet, and get pure water for all your needs - drinking, washing, and others.
Multiple arrangement options: The user-friendly innovative design of the under counter water filter allows the system to be hung on the cabinet wall or placed on the floor. For homeowners who wants to avoid drilling holes in the cabinet, the system is right for you. Note, this under sink water filter system is not designed for TDS reduction, It will retain minerals such as potassium, calcium, sodium, and magnesium, which are beneficial for your health.

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