Under sink ultrafiltration water filter (best to buy in 2022)

An ultrafiltration water filter uses a hollow fiber membrane to remove suspended and large contaminants, allowing fresh water and dissolved minerals to pass through. The under-sink ultrafiltration water filter works the same but is only installed under the kitchen or bathroom sink to filter cold tap water.

Comparisons

 NameImagefeaturesReplacement filterwhere to buy
1iSpring CU-A4 4-Stage with dedicated faucetiSpring F4-CUA4 Buy now Amazon
2Watts Premier 531130 Filter-Pure UF-3 with dedicated faucetWatts Premier 560039 UF-3 Ultra FiltrationBuy now Amazon
3PureDrop CUW4 Aquacube with dedicated faucetPureDrop FUFM1 Ultra-Filtration|PureDrop F3-CUW4 (no Membrane Included)Buy now Amazon
4Waterdrop 15UA-UF 0.01 μm Ultra FiltrationDirect connect
Ultrafiltration
WD-RF15-UF (Buy waterdrop)
Waterdrop RF15-UF (buy amazon)
Buy Waterdrop

Buy Amazon
5Waterdrop 17UA-UF 0.01 μm Ultra FiltrationDirect connect
Ultrafiltration
WD-RF15 (Buy waterdrop)
Waterdrop RF17-UF (buy amazon)
Buy Waterdrop

Buy Amazon
6Waterdrop 10UA-UF 0.01 μm Ultra Filtration Direct connect
Ultrafiltration
WD RF 10 UF (Buy waterdrop)
Buy Waterdrop

7Waterdrop TST-UF 0.01μm Ultra-Filtration Direct connect
Ultrafiltration
WD-RF15 (Buy waterdrop)

Buy Waterdrop

Buy Amazon
8 Waterdrop TSC-W with dedicated faucetTSPP/ TSUF/ TSCT Buy Waterdrop

Buy Amazon
9Waterdrop 15UB-UF 0.01 μm Ultra Filtration with dedicated faucet/UFWD-RF10-UF (Buy waterdrop)
Waterdrop RF10-UF (buy amazon)
Buy Waterdrop

Buy Amazon
10Waterdrop 17UB-UF 0.01 μm Ultra Filtration with dedicated faucet/UFRF17W-UF (Buy waterdrop)
Waterdrop RF17W-UF(buy amazon)
Buy Waterdrop

Buy Amazon
11Waterdrop WD-10UB with dedicated faucet/UFRF10W-UF (Buy waterdrop)Buy Waterdrop

12Waterdrop TSU B 0.01μm Ultra-Filtration with dedicated faucet/UFPP filter /UF filter/CT filterBuy Waterdrop

13Waterdrop TSU-Wwith dedicated faucet/UFPP filter/ UF filter/ CT filterBuy Waterdrop

How does Under sink ultrafiltration water filter work

Under-sink ultrafiltration water filter is installed under a sink and uses an Ultrafiltration membrane to remove contaminants in combination with other filters such as:

  • A sediment filter helps remove sand, silt, colloid, and any other sediment. 
  • The Granular Carbon Filter helps adsorb odor, chlorine, and VOCs.
  • The Block Carbon Filter helps adsorb odor, chlorine, and other contaminants. 
  • Post inline Carbon Filter help further adsorb odor and “polish” the water for a sparkling taste.

The hollow fiber membrane has 0.02 pores and uses water pressure to force water through the membrane. The water is forced to pass through the membrane, and large contaminants are removed.

Find out the best portable ultrafiltration water filter system.

The ultrafiltration membrane removes bacteria, protozoa, and some viruses from the water. The membrane does not remove dissolved minerals and retains beneficial minerals such as calcium and magnesium.

An under-sink water filtration system does not lower the TDS value; instead, it will keep minerals in your water. If you are interested in a filter that eliminates TDS, please consider a Reverse Osmosis (RO) system (tankless or under sink RO system).

13 best Under sink ultrafiltration water filter

  1. iSpring CU-A4 4-Stage Under Sink Drinking Water System White
  2. Watts Premier 531130 Filter-Pure UF-3 3-Stage Water Filtration System – WQA Certified
  3. PureDrop CUW4 Aquacube Tankless Drinking Water Filter System
  4. Waterdrop 15UB-UF 0.01 μm Ultra Filtration Under Sink Water Filter System
  5. Waterdrop 17UB-UF 0.01 μm Ultra Filtration Under Sink Water Filter System
  6. Waterdrop WD-10UB
  7. Waterdrop TSU B 0.01μm Ultra-Filtration Under Sink Water Filter System
  8. Ultrafiltration Under Sink Water Filter System Waterdrop TSU-W
  9. Waterdrop BS08 Stainless Steel Under Sink Water Filter
  10. Premier water 5 Stage Ultrafiltration Compact Water Filter System
  11. Waterdrop 15UA-UF 0.01 μm Ultra Filtration Under Sink Water Filter
  12. Waterdrop 17UA-UF 0.01 μm Ultra Filtration Under Sink Water Filter System
  13. Waterdrop 10UA-UF 0.01 μm Ultra Filtration Under Sink Water Filter System

Advantages of under sink ultrafiltration water filter

  • No wastewater
  • No beneficial minerals are removed

What is the best under-sink ultrafiltration water system?

The under sink ultrafiltration water system is available in two types: 

  • under sink ultrafiltration water filter system with a dedicated faucet
  • under sink ultrafiltration water filter direct connect filtration system

Under-sink ultrafiltration water filter system with dedicated faucet

The under sink ultrafiltration water filter system with a dedicated faucet is installed under the kitchen sink on the cold water tap and comes with a separate faucet.

The separate faucet is installed on the countertop or sink top, so drilling is required. On the countertop, you will have two faucets: one for filtered water and the other one for unfiltered water.

The filter is connected under the kitchen to the cold water line using a diverter and sends the filter to the separate faucet installed on the countertop.

The system does not waste filtered water since the cartridge is only installed to provide water for drinking and cooking, therefore, the cartridge will last longer saving you a lot of money.

The only disadvantage you need to drill an extra hole on the countertop to install the filter faucet.

  1. iSpring CU-A4 4-Stage Under Sink Drinking Water System White
iSpring CU-A4 UltraFiltration Under Sink Water Filter System,

iSpring CU-A4 is a 4-stage under-sink drinking water system. The 4-stages include:

5 microns PP Sediment Filter that helps remove larger particles like rust, sand, dirt. Sediment lasts for 6 to 12 months. But replacement filter using the link below

iSpring FP15Q Quick-Change 5 Micron Sediment Filter

This ultrafiltration filter uses hollow fiber membrane technology with a pore size of just 0.01 microns. The UF membrane lasts for 24 months. Buy a replacement filter using the link below.

iSpring FUF1 CU-A4 Ultra Filtration UF Membrane

The KDF and GAC filters remove chloramine, hydrogen sulfide, heavy metals, and other compounds. The filter lasts for 6 to 12 months. Buy a replacement filter using the link below.

iSpring FKG15Q Quick-Change Inline KDF/Carbon Filter for Ultra-Filtration

A Fine Activated Carbon Filter provides final polishing. The filter lasts for 6 to 12 months. Buy a replacement filter using the link below.

iSpring FT15Q Quick-Change Inline Carbon

All the replacement filters are available in one bundle and sold at Amazon using the link below

iSpring F4-CUA4 includes Sediment, UF, KDF, and Activated Carbon Filter, 4pcs

iSpring F3-CUA4 6-Month Filter Pack for 4-Stage 0.1 Micron Ultra-Filtration Water Filter Systems includes Sediment, KDF, and Activated Carbon Filter, 3pcs

The system can be installed at the sink, in the refrigerator, for coffee makers, and more.

The package includes Chrome finish drinking water faucet, 4 filters, and tubing all comply strictly with NSF/ANSI standards for safety and water quality.

iSpring CU-A4 is easy to install and maintain; push-to-connect fittings and color-coded tubing simplify the installation process. Twist On / Twist Off filter cartridges make changing filters faster.

  1. Watts Premier 531130 Filter-Pure UF-3 3-Stage Water Filtration System – WQA Certified
Watts Premier 531130-Pure UF-3 3-Stage Water Filtration System

The 3-stage water filtration system is perfect to reduce contaminants such as particulates, sediment, silt, lead, chemicals, and chlorine taste and odor.

This is the Watts Premier 3-stage water filtration system. The stages include:

  • 5-micron Sediment filter
  • 0.5-micron carbon block filter-remove lead and volatile organic compounds
  • Ultrafiltration membrane

It also utilizes Hollow-Fiber technology to trap and remove even the tiniest particles from your water.

The system is WQA Certified to NSF/ANSI Standard 42 and 53 and comes equipped with everything needed for installation.

It features the patented design with a shut-off valve and push-button filter changes that make it easy to maintain and install.

It is recommended to replace Sediment and Carbon Block Filters every 6 months, and Hollow-Fiber Membrane once a year

Buy the replacement filter below.

Watts Premier 560039 UF-3 Ultra Filtration, 5-Filter Annual Water Filter Replacement Pack -Kit includes two Sediment Filters, two Carbon Block Filters, and one Hollow-Fiber Membrane

Watts Premier UF Membrane-Replacement membrane

  1. PureDrop CUW4 Aquacube Tankless Drinking Water Filter System
PureDrop CUW4 Tankless Compact Ultra-Filtration Under Sink Water Filter System

PureDrop CUW4 Aquacube Tankless Drinking Water Filter System filters water in 4-stages including 

Sediment filters help remove sediments, dust, sand, particles, dirt, and rust

Pre carbon filter help remove chlorine, tastes & odors, cloudiness, and colors

The post-carbon filter helps remove chloramine, VOCs, harmful chemicals, and more.

The Ultrafiltration filter helps remove lead, iron, nickel, chromium, cadmium, calcium, aluminum, mercury, chlorine, chlorine treatment by-products, and hydrogen sulfide.

It is recommended to replace the PP sediment filter, carbon block filter, and ultra-micron granular carbon filter every 6 months to 12 months based on your usage and source water quality.

Buy replacement filters using the links below.

PureDrop FUFM1 Ultra-Filtration Under-Sink Replacement Membrane

PureDrop F3-CUW4 Ultra-Filtration Under-Sink 3-Stage Prefilter Replacement Water Filter Cartridges (no Membrane Included), White

The system includes a lead-free faucet with a beautiful chrome finish which is usually mounted on the counter

It includes push-to-connect fittings that simplify the installation process and minimize the possibility of leaks.

This system features an integrated LED filter change indicator so you don’t keep on guessing when to change the filter.

More ultrafiltration under sink water filter

  1. Waterdrop 15UB-UF 0.01 μm Ultra Filtration Under Sink Water Filter System
Waterdrop 15UB-UF Ultra Filtration Under Sink Water Filter System

Features

  • for Baçtёria Reduction
  • NSF/ANSI 42 Certified
  • with Dedicated Faucet
  • 16K Gallons Chlorine Reduction Capacity,
  • USA Tech
  • Available in white Waterdrop 15UBW-UF and black

Waterdrop 15UB-UF is a single-stage water filtration system this means it has one cartridge that filters water in 4-stages.

The system filter water in 4-stages including

  • The polyester membrane reduces large particles and sediment.
  • Ultrafiltration membrane- prevent any contaminants larger than 0.01μm to go through.
  • Activated carbon block –reduce chlorine, taste, and odor
  • KDF removes heavy metals and inhibits the growth of harmful substances.

It has a capacity of 16,000 gallons and a filter life of 24 months. Use the link below to buy replacement filters.

Replacement filter for the Waterdrop 15UB-UF in black 

Replacement filter for the Waterdrop 15UB-UF in black 

Waterdrop RF15W-UF (White)

Waterdrop RF15W-UF (White)

This model is also available in two other capacities, such as

  1. Waterdrop 17UB-UF 0.01 μm Ultra Filtration Under Sink Water Filter System
Waterdrop 17UB-UF 0.01 μm Ultra Filtration Under Sink Water Filter System

Features

Buy a Replacement filter for the Waterdrop 17UB-UF using the link below

Waterdrop RF17W-UF 0.01 Micron Water Filter (White)

Waterdrop RF17W-UF 0.01 Micron Water Filter (White)

Waterdrop WD-10UB

Capacity- 8000

Buy Waterdrop WD-10UB replacement filter using the link below

Waterdrop RF10W-UF 0.01 Micron Water Filter (White)

  1. Waterdrop TSU B 0.01μm Ultra-Filtration Under Sink Water Filter System
Waterdrop TSU B 0.01μm Ultra-Filtration Under Sink Water Filter System
  • Ultrafiltration Membrane
  • 3-Stage Filtration
  • Smart Panel
  • No Waste Water
  • Replacement filter

Waterdrop TSU-B is a multistage system that includes three filters packed in a sleek compact design. The three filters include:

It features a smart panel that includes electronic indicators on the front panel to notify you when to replace the filters by changing the color.

Watch a video of how it works

Waterdrop TSU-B is the same as the Waterdrop model WD-TSU-W but in a different color.

  1. Ultrafiltration Under Sink Water Filter System Waterdrop TSU-W
  • Ultrafiltration Membrane
  • 3-Stage Filtration
  • Smart Panel
  • No Waste Water
  • Replacement filter

It uses three filters

Watch the video on how to install Waterdrop TSU.

  1. Waterdrop BS08 Stainless Steel Under Sink Water Filter
Waterdrop BS08 Stainless Steel Under Sink Water Filter
  • Filter life span: 8000 gallons or 1-2 years
  • The water filter’s housing and bottom cap are made from 304 stainless steel material.
  • Come with a lead-free brushed nickel stainless steel faucet.
  • Replacement filter: Waterdrop WF08 Under Sink Replacement Water Filter

This is Waterdrop under sink single-stage water filters. It comes with one filter packed in the filter housing.

The filter has a lifespan of 8000 gallons or 1-2 years. The replacement filter is available using the link below.

Waterdrop WF08 Under Sink Replacement Water Filter

The housing, bottom cap, and faucet are made of stainless steel material that is food grade and lead-free.

How To Install Waterdrop Stainless Steel Direct Connect Under Sink Water Filter


Under-sink ultrafiltration water filter direct connects filtration system

Under-sink ultrafiltration water filter directly connects to the filtration system. It is also called an inline under sink water filter, under sink water filter without a separate faucet, or under sink water filter with no drill.

A direct connect filtration system does not come with a separate faucet, only a filter that is installed under the kitchen sink to the cold water line and provides filtered water on your existing kitchen faucet.

The under sink ultrafiltration water filter directly connects to the filtration system, requiring no drilling, saving countertop space, and no extra faucet required. This system is ideal for someone staying in a rental house. The only disadvantage of the system is that it is installed on the only faucet that is used to clean dishes that do not require filtered water, leading to filtered water wastage.

  1. Premier water 5 Stage Ultrafiltration Compact Water Filter System
Premier water 5 Stage Ultrafiltration Compact Water Filter System

Premier water is a five-stage ultrafiltration system. The 5 stages include:

  • PP Sediment Filter help remove sand, silt, colloid, and any other sediment 
  • Granular Carbon Filter To adsorb odor, chlorine VOCs, etc.
  • Block Carbon Filter To adsorb odor, chlorine, and other contaminants. 
  • Ultra-Filtration membrane uses a physical barrier filtration to filter out contaminants. Filters down to 0.01 Microns
  • Post inline Carbon Filter To adsorb odor and “polish” the water for a sparkling taste

The system is housed neatly in a box that can be mounted under a sink.

Periodic flushing of the UF membrane is recommended to remove contaminants, and a backwash valve is built into the system.

  1. Waterdrop 15UA-UF 0.01 μm Ultra Filtration Under Sink Water Filter
Waterdrop 15UA-UF 0.01 μm Ultra Filtration Under Sink Water Filter

Waterdrop 15UA-UF is a 4-stage under-sink water purification system. It is a single-stage system, meaning it comes with only one filter that filters water in four stages. The stages include

  • The polyester membrane reduces large particles and sediment.
  • An ultrafiltration membrane filters out impurities larger than 0.01 μm.
  • KDF inhibits the growth of harmful substances, prolongs the filter’s service life, and reduces heavy metals.
  • The activated carbon block reduces chlorine taste and odor. It also improves the taste of water

The filter lasts for 2 years or after treating 16000 gallons. Buy a replacement filter using the link below.

Replacement filter for the 15UA-UF from the waterdrop website and Amazon.

It is available in two colors black and white colors.

This system has a capacity of 16, 000 gallons, and the same model is available in a different capacity.

  1. Waterdrop 17UA-UF 0.01 μm Ultra Filtration Under Sink Water Filter System
Waterdrop 17UA-UF 0.01 μm Ultra Filtration Under Sink Water Filter System
  1. Waterdrop 10UA-UF 0.01 μm Ultra Filtration Under Sink Water Filter System
Waterdrop 10UA-UF 0.01 μm Ultra Filtration Under Sink Water Filter System
  • Capacity- 8000 gallons
  • Replacement filter-WD-RF10
  1. Waterdrop TST-UF 0.01μm Ultra-Filtration Under Sink Water Filter, Stainless Steel
Waterdrop TST-UF 0.01μm Ultra-Filtration Under Sink Water Filter, Stainless Steel

Waterdrop TST-UF is a multi-stage water filtration system, meaning the system comes with a different filter. 

The system is made of 304 stainless steel material that is durable, strong, and corrosion-proof.

The three filter treats water in 6-stages including

  • PP filter + non-woven fabric lasts 6–8 months. Reduces large particles, dirt, rust, and suspended solids (2 stages).
  • The UF filter + PP cotton lasts 12 months. Filter bacteria and colloids (2 stages).
  • CT filter+ non-woven fabric lasts 12–24 months—reduces odor and funny taste (2 stages)

It can be installed in two ways: you can either hang it on the wall or place it on the floor.

The replacement filter is available on the water drop website or Amazon using the link below.

Buy a replacement filter using the link below.

Waterdrop TST UF replacement filter

You can buy each filter on its own using the link below

How Waterdrop TST-UF Ultra-Filtration Under Sink Water Filter works

More under sink water filter

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